Green’s Dictionary of Slang

pee n.1

[pee v. (1)]

1. [20C+] urine; also attrib.

2. [1930s+] an act of urination.

In compounds

pee hard (n.) [hard-on n. (1)]

[1980s+] (Aus. prison) an erection on waking up in the morning.

In phrases

beat the pee out of (v.) (also kick the pee out of)

[1970s] to attack violently.

scare the pee out of (v.)

[1960s] to terrify.