When you and a a couple of your close friends, sometimes more, drift away from the actual party to do 'other things'...aka drugs, in the bathroom. Therefor starting your own separate party in a small little fancy room next to some strangers toilet.

I mean you've got running water, nice lighting, rolled up 20's. That's enough for a nice little soiree
*BANG BANG BANG BANG BANG*

Stranger: What the fuck is that banging noise coming from the bathroom?

Bathroom attendees: Don't worry, Bathroom Party, we're just nailing up picture frames *sniff* :D
by Link. November 21, 2010
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Started at Sherwood High School, it's when a huge group crowds a bathroom at the end of class and runs out at the same time and tramples shit.
Dawggg u goin to the bathroom party after 6th? And 7th? And 8th?

The idiots had 3 bathroom parties all back-to-back and in the same bathroom!
by 1lebreezy November 15, 2015
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When one person feels the immediate effects of a Chipotle burrito and rushes to the bathroom forgetting to lock the door. Many other people feel the same thing and enter the bathroom with him.
Jackson: Oh no. (Runs to the bathroom)
Hunter: Oh no. (Follows Jackson to the bathroom)
Hunter (bursting in the bathroom door): sorry man. We’re going to have to have a Chipotle Bathroom Party.

(Both men crouch over toilet)
by Poopassjackson April 7, 2019
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When you destroy some twelve year olds dream by choke slamming him into the sink
Yo my mans just Walmart bathroom party that kid
by JFKexperience75 May 25, 2019
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