Like (DYM 82)

Alright, listen up, buttercup. So, "DYM 82" probably refers to "Did You Mean", followed by the number 82. It's like saying, "Hey, I know what you meant to say, even if you messed it up." It's basically a shortcut for correcting someone, but in a lazy, internet-y kind of way. You probably use outdated memes because you are not up-to-date.