take the piss out of someone

take the piss (out of) (someone or something)

To tease, mock, or ridicule (someone or something); to joke or kid around (about someone or something). If you are so serious that you can't take the piss out of yourself every once in a while, you're going to have a hard time enjoying most of life. It really hurt Steph's feelings to know that the group had been taking the piss out of her that whole time.
See also: piss, take

take the piss out of someone

tv. to humble someone; to make someone—usually a male—less cocky, perhaps by violence. (Usually objectionable.) You need somebody to take the piss outa you!
See also: of, out, piss, take