Used by a chavvy male to specify a female friend or best friend, who is not specifically a girlfriend, possibly to boast that they aren't shallow towards the other gender.

Unfortunately it says the opposite as any non-chav bloke will just say friend and specify female if later required.
Guy 1 - I was talking with my girlfriend the other day right, well not girlfriend yano, girl that's a friend...

Guy 2 - The word's girlmate

Guy 1 - Shut it yeaaa'
by chiffmonkey January 5, 2011
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