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To hit on someone or fool around with them. Synonomous with mack
He was mashing on that chick so bad.

We WILL mash
Mash by JKix May 18, 2005
Related Words
adjective: often representing the excitement, euphoria, and adrenaline one experiences riding a fixed gear bicycle on the road after they see an intensely congested street of automobiles, buses, other cyclists, etc.
Holy shit, did you see the cars on Culver Drive?

Naw, why?

I posted up and mashed through them!
Mash by HED3 February 11, 2009
A machine gun/fully automatic firearm of some sort
I drew for da mash and riddled dem bwoys car wid bullets
mash by Caruthers August 7, 2005
Make out

Used extensively at University of Illinois and probably other college campuses.
mash by illini33 June 21, 2004
The act of a bird fluffing it's feathers in a dog-like shake.
"Did you see that budgie? He just mashed!"

"That eagle did a good mash just now."
Mash by Derbyshire Linguist September 3, 2022
To ride a bike (usually on the road) at olympic blazing speeds without regard for human life, so fast that you think your legs and body will explode.
those hipster kid don't have jobs, all they do is smoke american spirits and mash on their fixies!
mash by mAgik bUS December 8, 2009