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
one who masterbates untill their dick falls off
your a wanka

stop wankaing with yer jamie

oh, ive wankaed it this time
by Daniel Carron =D March 15, 2007
straight up faget
that kid is a wanka macin it to guys
by peter May 07, 2003
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