Shagdown
General slang that began in hasher circuits to refer to going to the pub after a day's work, tough match, or strenuous labor.  Shower afterwards and then just relax.
Note: Despite containing the term shag in it, sex is not necessarily part of a shagdown.  It can be, of course.
Clive: That was a great match, mate.
Liam: Yeah, reckon it's time for a shagdown?
Clive: Aye.

Valerie: Great race, told you I'd win!
Tom: Yeah, let's head back to the lodge for some shagdown.

Rupert:  I'm bushed... gonna head to the pub for some shagdown, you coming with?