To operate a vehicle recklessly at high speeds; to smash in a vehicle or on foot
Jump in the ride and mash out.

Hop in le ridezor and mash.
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a telivision show which ran from 1972-1983 about Surgeons at a korean war saving Casualties and there Adventures
Mash is the best show on T.V.
by Admir DeMondo December 24, 2003
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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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Term Expressed When Someone Is Under the Influence of Drugs And Alcohol And Is Incredibly Out Of It.
"Crazy Night Last Night, I Got So Mashed"
by PikeyHoedown June 9, 2009
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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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