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.
Friend #1: Dude what's up with Jerry?
Friend #2: He took a really big hit and now he's concussed
by RagingPrune December 6, 2015
What eric lindros gets every time he steps onto the ice.
Commentator1: and another big hit by stevens...slamming lindros to the ice....

Commentator2: all of his brain cells have just left the building.
by ArchDevil July 26, 2004
The feeling after your friend hits you on the head with her frigging math book!!!
Friend- **picks up math book**
(SLAM)
Me- wth?!! I think you have me a concussion!

Friend- hehehe
(SLAM)
by Lily LuLu October 30, 2019
Kori was concussed after sneezing so hard that she startled her kittie cat.
by arrrbooty May 31, 2006
A White boy camethis up!it means a BLOW TO THE Head,but domish like!
Man she can run and give me a concussion,AT THE SAME TIME!!!
by Travis Fountain May 8, 2003
oral sex done to a man that was very pleasing;when eyes roll in back of head
"A I just a concussion"
by ya boi swingem October 11, 2003
When you fucking a bitch so hard that hoe gets a concussion
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
by TMan69 March 9, 2020