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3.
when some kid in an argument doesnt have anything better to say he just wails his arm everywhere and shouts out "YOU STUPID"
Since Carver didnt have a come back to Matt about how he dissed how his mom likes sloppy matts, carver just threw his arm everywhere and screamed YOU STUPID
by The Bus Driver February 20, 2005
 
1.
silly, crazy, comical
Someone said something extremely funny and I said "YOU STUPID!"
by kaiyecreme November 25, 2006
 
2.
Something related to describing a person ;

Often refered to R0B
In a chatroom :

17:35 * Joins: YouStupid (~User@219.95.223.11)

<user> Hey R0B! Someone joined to remind you of what you are and tell the rest of the people here as well!
by coolie April 05, 2005