Literal definition is, intoxicated female sexual organ. When the term is used colloquially it refers to an intoxicated individual. The term can be abbreviated to, 'WG'.
Boy: yeah bruv that girl iz waste gash.
Boy2; yeah i know so is her mutha boy1: so what your mum is waste gash to.
Boy 2: thats well harsh, yo mum is a sket cadet, fool.
By Marsiella
Waste Gash
Someone that sleeps with their mates boyfriends. Really ugly and has a body of an 8 year old boy. Shovelchin.
A wasteful vagina. Often belongs to someone of a hideous frame and face, therefore a perfectly good vagina could be wasted because no one would want to fuck a beast.