Equivalent to stupid. Originates from some accents pronouncing "stupid" as "shtoopid." Some speculate that the main accent in question is an Indian accent.
Your car is shtoop!
You're shtoop you dung-ass!
To make love; to have sex. (jewish version)
My brother shtooped this girl at my house last night while my parents were sleeping.
My cousin said she would shtoop Nelly.