Crypto Slang: The Terms You Will Actually Encounter
A working glossary of the terms crypto communities actually use day to day, translated into plain English instead of left for you to piece together from context.
By Firoz Khan|31 August 2026|Updated 26 September 2026|4 min read
Crypto communities have built up a dense layer of slang, partly for speed, partly as an in-group signal. None of it is difficult once someone actually explains it, which mostly nobody does. Here's the vocabulary that shows up most often, grouped by what it's actually describing.
The market-mood terms
HODL started as a misspelling of 'hold' in a Bitcointalk forum post titled "I AM HODLING" on 18 December 2013, and stuck as shorthand for holding through volatility rather than trading it. The phrase "hold on for dear life" was attached to it afterwards. FUD is fear, uncertainty and doubt, usually used to dismiss criticism, sometimes fairly and sometimes as a way to wave away a genuine concern. FOMO is fear of missing out, the feeling that drives buying after a price has already risen sharply. A bull market is a sustained period of rising prices and optimism, a bear market the opposite.
The ownership and security terms
Self-custody means holding your own private keys rather than leaving assets on an exchange. A seed phrase is the set of words that can recreate your wallet and every asset in it, treated with the same seriousness as the keys to a safe. A hot wallet is connected to the internet, a cold wallet isn't. A rug pull is when a project's creators abandon it and disappear with investors' money, usually after building hype specifically to enable the exit.
The trading terms
DCA, dollar-cost averaging, means buying a fixed amount on a fixed schedule rather than trying to time an entry. Spot trading means buying and holding the actual asset, as opposed to derivatives or leverage, where you're trading a contract based on the price rather than owning the thing itself. A whale is a wallet large enough that its trades can move the market. ATH and ATL are all-time high and all-time low.
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The blockchain-mechanics terms
Gas is the fee paid to have a transaction processed, priced in gwei, a fraction of the native coin. Layer 2 refers to a separate network built on top of a main blockchain (the layer 1) specifically to process transactions more cheaply before settling back to the main chain. Mainnet is the live, real-money network, testnet is the practice version developers use with worthless test coins.
UK terms you will meet
A disposal is the tax term for selling crypto, swapping it for another cryptoasset, or using it to pay for something. Each one can trigger Capital Gains Tax. A pool is the group of all the tokens of one type you hold, with a single pooled cost that HMRC uses to work out gains. The annual exempt amount is the gain you can make in a tax year before Capital Gains Tax applies, £3,000 for 2026/27.
FCA-registered means a crypto firm has registered with the FCA for anti-money-laundering purposes. It is not the same as having deposit protection. The FSCS is the Financial Services Compensation Scheme, which the FCA says will generally not cover crypto losses. The Warning List is the FCA's list of unauthorised firms, and a firm missing from it may still be a scam. A cooling-off period is a delay that UK rules require for first-time crypto investors responding to certain promotions. A crypto ETN is an exchange traded note that tracks a cryptoasset's price and is a debt security issued by a company. UK retail investors have been able to buy them since 8 October 2025. A custodian wallet provider is a firm that holds cryptoassets, or the private keys to them, on behalf of customers.
The terms worth treating as a red flag
'Guaranteed returns', 'to the moon' and 'when lambo' aren't neutral slang, they're markers of a community built around hype rather than analysis. None of them appear in any credible discussion of risk or fundamentals, and a project or group leaning heavily on this language is telling you something real about how it expects to attract buyers.
In the UK there is a formal version of this warning. The FCA says crypto promotions should carry a clear risk warning and should not offer incentives to invest, including refer-a-friend bonuses. A pitch that promises guaranteed returns, or that dangles a bonus for bringing in friends, is not following those rules.
A reminder
The FCA risk warning still applies to higher-risk crypto content. Always assess how much risk you are willing to take before buying.
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