Good thing you quoted Shaven. I wouldn't have known who the hell you were replying to!
Oh wait! Was that a piss-take?
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Take the piss (out of someone) vb. British -- to mock, deride, poke fun (at). This vulgarism has been in widespread use since the late 1940s. The original idea evoked by the expression was that of deflating someone, recalling the description of a self-important blusterer as 'all piss and wind.'