An innuendo used at the end of a speech to imply you like fingering buttholes.
Ben: "...so if you have any other questions come find me after this presentation. I will be mingling in the atrium".

Evan: "I wouldn't mind mingling in your atrium"
by d123a January 29, 2011
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Kids in high school who hang out in the atrium and are typically looked down on and considered weird. They are usually playing pokémon or watching anime.
Don’t talk to him, i heard he’s an atrium rat!
by thatswack19 April 11, 2020
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In law school (or most grad schools), the term for what you feel like doing during finals, diving off the atrium. Almost all law schools have multistory atriums centered in the middle of a high stress environment.

Many law schools have diving programs after finals as a stress reliever. Unfortunately, most atriums lack an adequate diving pool.
Man if I end up studying this same stuff for 16 hours straight I'm gonna do the atrium swan dive.
by LawStudentsEverywhere April 29, 2011
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