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1.
Origin: Ireland. Contraction of "taking the piss off someone" and "pulling the leg".

The first occurrences of the phrases were reported from the early 2010's in Cork, Ireland.

Firstly an involuntary mix between the two aforementioned expressions, it quickly became popular.
-Do you know that they will close the dress shop you like and will open a DYI one instead?

-Stop pissing my leg! It can't be true!
by françois adélaïde January 14, 2011