A ridiculous over statement used when people actually are not "Rolling on the floor laughing (their) ass off"
In reality, it means:
Really, Only Fibbing. Looking Moderately Amused Only.
Person A: I'm so tired my eyes hurt
Person B: LOL
Person A: Did you actually LOL?
Person B: No! ROFLMAO
Person A: Are you actually laughing now?
Person B: No.
Person A: You're an idiot.
The act of masturbating while on your period.
Cait: I haven't masturbated in 3 weeks, and now I'm on my period!
Nick: Dude, why don't you just have a red wank?