A noun describing the strange pseudo goth/weeb/cosplayer/borderline bdsm hybrids (often in high-school) who amass in the stair-wells in abnormally high numbers. Stair trolls tend to wear things like cat-ears, tails, fingerless gloves, and overly large sweaters that go past their fingers. In addition to these items, they are often toe-walkers, or wear animal slippers, simulating pawed animal feet.
In essence, a stair troll is a pseudo weeb/cosplayer/goth/bdsm individual, confined within a tight social space where they feel outcasted, and herd together in reclusive areas, where they may find strength in numbers.

They are sometimes seen with hideous piercings, exotic hair colors, and foul attitudes.

Nobody knows where the stair troll comes from, and they are theorized to reproduce asexually, During lunch, they do not eat at tables, and instead are found in random locations around the cafeteria. Stair trolls never make eye contact, and cannot function without their posse. When addressed by a normal person they typically respond by hissing loudly.
Joel: Bruh those BDSM weebs at the stair-well just threw away all of their food. Nobody ate anything. When I tried to approach them they made crazy animal sounds and crawled away and started licking their paws.
Andrew: Didn’t you read the damn sign dude? Don’t approach the stair trolls.
by mooosinb July 4, 2019
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