To ride a bicycle furiously through traffic without any disregard for cars, traffic lights, pedestrians, stop signs, or the fucking man.
Hey let's go mash through venice beach and show those beach cruisers how to actually ride a bike right.

FUCK BRAKES, FIXIES FOR LIFE
by Mr. UCSD August 4, 2008
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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
by JKix May 17, 2005
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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."
by Derbyshire Linguist September 3, 2022
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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!
by HED3 February 11, 2009
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A guy that seduces multiple women at once, regardless of whether he’s in a relationship or not. Mash will usually talk to women from different areas, so that they will not learn of each other’s existences.
Girl 1: I just got a new boyfriend, his name is mash!
Girl 2: Oh really? Because it seems like he’s my boyfriend too
by well_thats_good_ August 1, 2019
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BASEBALL:TO BE A PROLIFIC HITTER OF TAPE MEASURE HOMERUNS.CANSECO...MC GWIRE...BONDS...SHEFFIELD
HOPEFULLY WE CAN GET GRIFFEY FOR THE STRETCH RUN.HE'S STARTIN' TO MASH JUST LIKE OLD TIMES.
by L.MARTIN August 19, 2005
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The process of making tea, esp. the infusion of the leaves/bags in the boiling water. Purists would suggest that you cannot mash instant (freeze dried) tea.
Are ye mashin'? Me tongue's dry as a camel's arse!
by maffoor September 24, 2004
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