'tard slap

a 'tard slap is a term used to describe the motion of slapping one's own upper chest with the side of the opposite hand. it is used when mocking retarded people or when accentuating the fact that one did something retarded. often accompanied by a "huh huh huh" type of fake laugh.

screenname1: omg i just spilled coffee all over my science homework
screenname2: hahah you're so stupid.
screenname1: *'tard slap*