A poker term that found its way into common speech and crypto. Means all your chips / money / tokens / coins are fully invested. You can be all in on a coin, all in on a sector or all in on crypto generally.

Buy The Fucking Dip - A call to step into the market when it is low and buy the dip, in the expectation that the market will go higher and result in a profit. A frequent call of Twitter influencers and crypto exchange owners who want plebs to buy their bags. Typically they will tweet that they are "all in" on bitcoin or crypto, then announce smugly 2 days later that they somehow found a few million under the sofa cushions to buy the fucking dip.