Green’s Dictionary of Slang

tits adj.

[tit n.2 (4)]

1. (S.Afr./US, also supertit, titties) wonderful, excellent.

[US]Current Sl. I:2 6/1: Tits, adj. Something very commendable.
[US]Da Bomb [Internet] 29: Tits: Extremely good or fine; one level above bitchen. That car is tits!
[SA]Mail & Guardian (Johannesburg) 9 Dec. [Internet] Popular south oke words are [...] ‘titties’ or ’supertit’, meaning awesome.
[US]C. Hiaasen Nature Girl 39: But a picture of me, dead, and with my eyeballs chewed out – that’d be tits!
[US]C. Eble (ed.) UNC-CH Campus Sl. Spring 2016 10: TITS — good: ‘This ice cream is tits’.

2. (US campus) easy, simple.

[UK]J. Mowry Six Out Seven (1994) 88: ‘So how it go, man?’ Toby demanded eagerly. ‘Like tits, huh?’.