slash, v. — Green’s Dictionary of Slang

slash v.

1. in senses of aggression.

(a) to beat (up).

1834		‘A Grand Turn-Up’ in Randy Songster in Spedding & Watt (eds) I 187: Slashing and tearing and milling and swearing, / At the mill between ragged Jack and dirty Dick!].
1841		Sun. Flash (NY) 19 Sept. n.p.: Frazer [...] let fly with his right and brough him down [...] Frazer slashed him down too.
1862		Golden Age (Queenbeyan, NSW) 31 July 2/6: There is Centaur, a horse-breaker, great in administering punishment to a colt, or, as he elegantly terms it, ‘slashing the beggar’.
1946		A. Marshall ‘Bushman’ in Tell Us About the Turkey, Jo 99: He slugged and smashed him. [...] He sent him reeling back among the yelling men. ‘Slash the cow.’ ‘Did you see that?’ ‘Jesus!’.

(b) (US black/campus) to demolish someone verbally.

1967–8		Baker et al. CUSS 198: Slash Make uncomplimentary remarks about someone.
1983		R. Klein Jailhouse Jargon and Street Sl. [unpub. ms.].

2. to urinate [slash n. (2)].

1963		C. Wood ‘Prisoner and Escort’ in Cockade (1965) I iii: I slashed on his boots.
1973		M. Amis Rachel Papers 189: If you can slash in my bed (I thought) don’t tell me you can’t suck my cock.
1993		B. Moore Lex. of Cadet Lang. 348: usage: ‘He was so pissed he slashed all over his shoes.’.
2000		N. Griffiths Grits 79: My art booms like it ulweys does wance am inside, an a need ter slash.
2011		S. Kelman Pigeon English 6: Piss and slash and tinkle mean all the same (the same as greet the chief).

slash job (n.) [job n.²]

(US prison) slashing one’s own wrists in a suicide attempt.

1992

Bentley & Corbett Prison Sl. 88: Slash Job Self-mutilation of the wrists.

slash me!

(US) a euph. excl. of emphasis.

1873

Weekly Kansas Chief 27 Feb. 1/3: ‘Slash me, if there ain’t too many of them!’ ejaculated Joe.