take the piss
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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). Primarily heard in UK, Ireland. 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. Brian was a bit of a troublesome student and tended to take the piss whenever class began.
take the pissBRITISH, INFORMAL, VERY RUDE
1. If someone takes the piss out of another person or thing, they tease them or make jokes about them in an unpleasant way. Men will hit each other if one thinks the other is taking the piss out of his car. Note: You can call an instance of this behaviour a piss-take. This is a piss-take of the standard cop movie.
2. If someone takes the piss, they say or do something unreasonable. For them to do what they've done, I think they're taking the piss, really. You want me to have the kids on Friday night? You're taking the piss. Note: `Piss' is a slang word for urine.
take the piss (out of)mock someone or something. British
1998 Spectator It must be admitted, however, that any child who tried nowadays to follow my priggish example would, probably rightly, be accused at once of taking the piss.