Green’s Dictionary of Slang

teasing, mocking, fooling around.

1965		J. Orton Loot Act I: None of your piss-taking. Is that understood?
1998		K. Sampson Awaydays 5: It’s only lately that I’ve felt entitled to join in the piss-taking.
2000		Indep. on Sun. Mag. 9 Apr. 62: We were piss-taking and having a laugh.