Equivalent to stupid. Originates from some accents pronouncing "stupid" as "shtoopid." Some speculate that the main accent in question is an Indian accent.
The group of people hangingoutside during a party. Usually the smokers and tokers.
Person 1. Hey man you wanna go burn some of this up?
Person 2. Hellya *go outside*
Person 1. Lets smoke this with that group of people
Person 2. Oh, you mean the stoop group
Person 1. Ya -_-