Pat Cash, v. — Green’s Dictionary of Slang

Pat Cash v.

[rhy. sl.= slash v. (2); ult. Aus. tennis star Pat Cash (b.1965)]

to urinate.

1997		Roger’s Profanisaurus in Viz 87 Dec. n.p.: Pat Cash rhym. slang. Slash; piss; siphon the python. From the Australian tennis player.
2003		B. Dark Dirty Cockney Rhy. Sl.