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The action marks preceding a logo or cartoon character as it runs. It is the onomatopoeia of these action marks.

The UCSD improv comedy team is named for these marks. This is not an acronym.
The logo for the LA Clippers has action marks preceding the basketball. These are foosh marks.

"It's like the word itself is running. It's like, foooooosshhhh!"
foosh by Mark Monaghan February 10, 2008
Related Words
A highly caffeinated mint that can keep you up all night studying for midterms and finals.
I'm gonna take me some Foosh before studying for chem.
foosh by mmmfoosh June 14, 2007
Spelled Foosh or Fush
F-oo-sh
The correct spelling and pronunciation of the common misspell and common mispronunciation of fish
My favorite food is foosh.
Foosh by Foosh not fish December 19, 2019
In going to the bathroom to eliminate a stool but it comes out as a liquid ( diarrhea ). The sound of falling water makes a fooshing sound.
Foosh, fooshing, fooshed ,

Lately every time I eat I have to foosh. Somethings wrong with my system I’ve been fooshing all day. I feel better now, I just fooshed.
Foosh by A.H.W.S. July 28, 2021
Southern slang.
Used to say blow on.
If something is too hot, you foosh it.
Make sure you foosh it. It's hot.
Foosh by trollerbin. May 15, 2018
A person who genuinely loves to fuck a robot.
Don- Did you hear about Mike Pence?
George- Naw man
Don- Dude, I hear he’s a foosh.
Foosh by Frilo January 11, 2021