Few fries short of a happy meal

a much more humorous way of defining your friend as retarded.

Friend 1: Donny is eating paste...

Friend 2: Yeah, he's a few fries short of a happy meal.

Friend 1: dude i got in a car crash yesterday

Friend 2: did you survive!?

Friend 1: your a few fries short of a happy meal arent you?

Friend 2: ....... "o look a butterfly"