A misspelling of "holding." Hodling means "holding a cryptocurrency" for future profits and not selling. The term came from the misspelled "I am hodling" in an early Bitcoin forum when the crypto's price was dropping. To "hodl" evolved into "hang on for dear life." The Twitter hashtag #HODLGANG was created for hodlers of cryptocurrencies. See Bitcoin pizza
Hodling Is a New Word
When it comes to cryptocurrencies, hodling is as valid a word as anything else, witness this comment after cryptos took a serious dive in mid-2021.