Stuptarded is an adjective. It is a compound of stupid and retarded. Something really idiotic.
Friend-"Hahahaha i just walked in to a pole"

Other friend-" woooowww... that was hella stuptarded"
by EmKat<>< August 29, 2011
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When someone call someone else dumb/retarded but the are more dumb/retarded that that person
Boy a tell boy b he is stupid but get 8/40 in a test
Stuptarded
by thegreatest T October 9, 2019
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