What does p***take stand for?

The Oxford English Dictionary has this definition:

piss-take  n. colloquial (chiefly British, Australian, and New Zealand) a parody, a send-up; an instance of mockery

Related to this is the earlier attested expression take the piss (out of):

colloquial (chiefly British, Australian, and New Zealand): to make fun (of), to mock, deride, satirize

(Ibid.)