look up any word, like the eiffel tower:
A random girl.

Generally used in a derogatory sense, expressing distaste for the person in question.

Derives from 'Next man' which in turn derives from the phrase 'as much/well/good as the next man'.
"Bruv, forget about her, she was just some Nextgash. There's plenty more next gash in the sea."
by Meeeeeeike September 26, 2012