To masturbate.

The word comes from the phrase "Bash the Bishop" i.e. masturbate. (The Bishop in a game of chess resembles a bell-end.)
I had an epic bash over betty last night. She has some mighty fine ass.
by 1st Earl of Granville February 17, 2009

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verb. to wank, or masturbate.
UK slang made famous by Nappa.
"You get no gash wasteman...i know that you bash wasteman"
by MC Blitzkrieg February 18, 2006

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To verbally attack.
Even though I'm well within my rights to, I'm not about to bash her in this letter.
by Purplegrass February 05, 2011

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To repetitively do something until it is no longer fun. Can refer to any hobby, though often gaming. Can also refer to listening to a song so much that you get tired of it.
Verb: 'I'm totally going to bash that new Xbox game I got.'
Noun: 'John hasn't left his computer desk in days- he is such a Warcraft bash.'
by buttons0191 January 15, 2011

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bash was short for bay area skinheads in the 1980's a gang of racially concious skinheads who did some stupid things,but also helped combate anti-white bias and gang relate crimes against whites. also a group of skinheads in brooklyns avenue n park used the name bash short for brooklyn area skinheads

probably the majority of sf's bash members are now gash -gay aryan skinheads lol
by NLR718 July 15, 2006

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When one takes a hodgepodge of alcohols like vodka, whiskey, beer, etc and pours it into a garbage-can sized container, mixes it together and adds fruit punch to make a sweet tasting incredibly drunkening substance known as "Bash". A very popular beverage at old fashioned block parties.
Never drink Bash if you don't want to get hammered.
by Stevez123 December 18, 2011

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to masturbate like a cockney
"i bashed last night while finkin of you innit"
by Dick September 28, 2004

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