Flag depicting the cross of St. George (red cross on white background) carried by loud football fans, or attached to their cars. So called because it gives the bystander a good clue as to the masturbatory proclivities of the bearer.
Mainly found in southern U.K.
Bearers of wanker flags can often be heard making noises similar to 'ING-UH-LAAND', 'TOOO NIL', and other such inanities.
I was going to go down the pub for a swift pint but it was full of twats carrying wanker flags!
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