Seriously drunk, or high on drugs to an extreme point
"I'm mashed off me face."
by Mad Walrus August 4, 2002
completely out of it, after excess alcohol or marijuana.
shit man, i was complete mashed last night..
by richard January 25, 2004
adj. to be drunk on alcohol and stoned on marijuana (cannabis) at the same instant
he got mashed, was playin xbox last nite wiv the lads, then terry brought a few eighths round and it all went a bit wheeee!
by tiesto August 15, 2004
where a fat bitch gets screwed so hard the fat creases on her ass get a rash
fuck me she got mashed
by the creator of words December 5, 2010
To carelessly destroy something in the past tense.

A way to prepare potatoes.
Did you see that apartment when Ted moved out? It was MASHED!

Did you see the way Ted made that potato? It was MASHED!
by JenThe80'sFan February 3, 2004