Green’s Dictionary of Slang

piss, the phr.

1. [1930s+] a general intensifier, the essence, the ‘daylights’.

2. a general intensifier used with questions, e.g. what the piss...?; var. on hell, the phr. (1)

In phrases

beat the piss out of (v.) (also mangle the piss out of, pound..., whop..., beat the dog-piss out of, beat the holy piss out of, ...the living piss out of, stomp the pissin’ out of) [whop v. (1)]

[1930s+] (orig. US) to beat severely.

kick the piss out of (v.)

[1930s] to beat severely.

knock the piss out of (v.)

[1970s] to beat up, to assault.

rip the piss out of (v.)

[2000s] to tease aggressively.

scare the piss out of (v.)

[1960s+] to terrify.

take the piss (out of) (v.) (also piss-take)

1. [1930s+] to tease, esp. aggressively.

2. [1930s+] to attack verbally, to sneer or jeer at.

3. [1980s+] to make something up, to say something ludicrous, to make grand claims, to joke; e.g. he must be taking the piss, he must be joking (because what he is saying is so ridiculous or unfair etc).

4. [1990s+] of a person, to act absurdly, to play the fool.

5. [1990s+] of a man, to have sexual intercourse.

whip the piss (out of) (v.)

[1990s+] to beat severely.