a girl who is completely flat chested or has a flat ass or a combination of both.
"Man that chick is so flat, she is a complete wanka."
by Officer Jack Meoff February 21, 2008
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Someone from South Africa who masterbates a lot.
"That Ron is such a wanka!"

"Oh, i think he was from england"
by Gastong Plastic Surgery September 02, 2009
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