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Someone who's in a bit of a huff. 'Size' can substitute 'strop' if saying someone has a strop on. Currently used by youths to make people like me feel old.
Teenager 1: "You well fancy the teacher."

Teenager 2: "I bloody don't!"

Teenager 1: "OoooOOOooo, he's got a size on!"
by GMCarangi January 23, 2008
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