Green’s Dictionary of Slang

(US) a sexually promiscuous person.

1974

D. Jenkins Dead Solid Perfect 88: Donny has a simple explanation for why there are all these indoor athletes around [...] ‘[W]hat else are they gonna do besides play Slip Off and Trick Fuck?’ .

(US) craps dice.

1927		F.M. Thrasher Gang 90: Crap-shooting, or ‘indoor golf,’ [...] has been called the African national game.
1953		‘Harry Grey’ Hoods 166: Where can we play an interesting little game of indoor golf? [HDAS].

(UK Und.) a reserve of cash for use in day-to-day life rather than the proceeds of a robbery.

1977

G.F. Newman Villain’s Tale 20: ‘You wanna sit in, Jack?’ one of the players asked. ‘Might change my fucking luck.’ ‘Gotta get my bit of indoor money somehow.’ Lynn pulled up a chair.

sexual intercourse.

2002

Vocabula Rev. Jul. IV:7 🌐 There are many jocular noun constructions that also provide the same meaning, and range in acceptability, although none of them has the versatility of their one-word equivalents: ‘Ugandan affairs,’ ‘country matters,’ ‘parallel parking,’ ‘horizontal folk-dancing,’ ‘you know what,’ ‘indoor sledging,’ ‘knee-trembler.’ Again, as the allusion retreats from sex and approaches humor, it becomes more acceptable.

(US) sadomasochistic activities.

1987

personal ad, adult bookstore Murray & Murrell Lang. Sadomasochism (1989) 85: Indoor sports enthusiast desires meetings with rubber, leather aficionados.