good, n. — Green’s Dictionary of Slang

good n.

1. (orig. US) alcohol; thus get good, to get drunk.

1843		in G.W. Harris High Times 28: Each party should [...] treat: a quart of the good.
1897		Ade Pink Marsh (1963) 173: I got good on gin an’ honey.

2. (drugs) phencyclidine.

2001

ONDCP Street Terms 10: Good — PCP .

3. heroin.

2001

ONDCP Street Terms 10: Good — [...] heroin.

4. marijuana.

1996		OutKast ‘Two Dope Boyz’ 🎵 I smoke good, cuz see it go good wit them flows.
2007		UGK ‘Life Is 2009’ 🎵 Chill at the Ponderosa and smoke that good.
2012		DJ Khaled ‘Outro’ 🎵 Smokin good, counting paper, tryin to dodge the Babylon.

do a bit of good for oneself (v.)

(Aus.) of a man, to seduce, to gain a woman’s sexual favours.

1951		D. Stivens Jimmy Brockett 20: Tell us about the time you did a bit of good for yourself with that English actress.
1986		C. Bowles G’DAY 7: Shane and his friend Macka are going to the disco. [...] They are hoping to crack on to some tarts and do a bit of good for themselves.

do (oneself) a bit of good (v.)

1. to make money (e.g. by a successful wager).

1890		Sporting Times 22 Feb. 3/1: One of the waiters [...] took great pains to shew him the greatest attention in the hope of being told ‘something’ to, as he himself expressed it, ‘do himself a bit of good’.
1948		‘Josephine Tey’ Franchise Affair (1954) 209: ‘Bill did a bit of good too. Going to give his missus a fur coat’.

2. to improve one’s situation.

1959		F. Norman Fings I i: No well, I fort I might come over and do meself a bit of good.
1971		T. Lewis Plender [ebook] ‘How do you mean, do yourself a bit of good?’.