Can also be linked to a wicked laugh when you are about to do something bad but in your mind funny.
Used on occasions of extremely epic circumstances where something didn't just make your day but it made your entire life.
Frank: Really?! They mml!
Justin: Yeah, that concert MML!
Melissa: I got bitten by a dog today.
Justin: haha mml
Melissa: That's not funny, I had to get stitches and everything!