HODL is a term derived from a misspelling of "hold," in the
context of buying and holding Bitcoin and other cryptocurrencies. It's also commonly come to stand for "hold on for dear life" among crypto investors. The term HODL (or hodl) originated in 2013 with a post to the Bitcointalk forum. See more here:
https://www.investopedia.com/terms/h/hodl.asp