When someone's high, but you don't want everyone to know. It can be used around parents and just generally adults as a way to covertly mention how stoned your friend is. This usually only works if the concussed person participates in some kind of sports.
by RagingPrune March 13, 2016

Commentator1: and another big hit by stevens...slamming lindros to the ice....
Commentator2: all of his brain cells have just left the building.
Commentator2: all of his brain cells have just left the building.
by ArchDevil July 26, 2004

Friend- **picks up math book**
(SLAM)
Me- wth?!! I think you have me a concussion!
Friend- hehehe
(SLAM)
(SLAM)
Me- wth?!! I think you have me a concussion!
Friend- hehehe
(SLAM)
by Lily LuLu October 29, 2019

adjective: having a concussion
by arrrbooty July 28, 2008

by Travis Fountain May 07, 2003

"A I just a concussion"
by ya boi swingem October 11, 2003

James: I was with Ashley last night
Mark: Oh yeah? How’d that fucking go bud
James: Fucked her so hard I gave that bitch a concussion
Mark: Oh yeah? How’d that fucking go bud
James: Fucked her so hard I gave that bitch a concussion
by TMan69 March 09, 2020
