Moon, as crypto slang, is best known from the phrase "to the moon", which is covered in full under To the Moon. This page explains the single word and how it is used on its own.
As a verb, "to moon" means for a price to rise very sharply in a short time, as in "this coin is going to moon". As a noun it means such a rise or its peak, and "mooning" describes a rally in progress. The impatient question "when moon?", covered under When Moon, asks when a hoped-for surge will finally arrive. The word sits alongside other upbeat slang such as Lambo and rocket emojis in online trading chat.
The term expresses hope or hype rather than analysis, and it is often used ironically when prices are falling. Posts promising that a token will moon are common in promotion of small, illiquid coins, a pattern regulators link with pump-and-dump schemes. The word should not be confused with Reddit Moons, a token once given to users of a Reddit community, or with a moonshot, which describes an ambitious project or high-risk bet.