another way of saying "I don't give a shit"

Short way to let a person know over text that they are laughing/thought something you said was funny. It however doesn't really reflect how much they are actually laughing/how much they actually thought something you said was funny.

A sound made when laughing

an over-used phrase on AIM.

Mandark's Laugh from Dexter's Laboratory.

Something one says when one finds something funny.

When you’re being dead serious