NGMI stands for Not Gonna Make It, a popular slang often used by crypto investors. NGMI is an expression of disapproval or disappointment towards a decision. For example, you see someone else buying token A that you don’t think is good and you say “You bought coin A? NGMI”.
The term NGMI is usually used jokingly but others may feel offended. In addition, NGMI is also the opposite of the popular term WAGMI or We’re All Gonna Make It which indicates a positive attitude.