Green’s Dictionary of Slang

make it v.

1. in senses of existence, achievement.

(a) [mid-19C+] to subsist, to survive, often as phr. just barely making it, also used in greeting, as in How you making it?

(b) [late 19C+] to achieve (something).

(c) [20C+] to be successful; thus make it big, make it good.

(d) [1910s+] to manage, usu. in context of movement.

(e) [1930s–60s] (US prison) to be granted parole.

(f) [1940s+] to survive, to stay alive.

(g) [1950s+] to get on, to relate.

(h) [1960s+] to achieve a climax, to orgasm.

2. in senses of action.

(a) [1930s+] to do something, to visit or be at a place, to arrive.

(b) [1950s+] to move, to get on, to run off; also as imper.

3. [1950s–70s] (US drugs) to take drugs, esp. opiates.

4. [1980s+] to stop doing something, to abandon.

In phrases

make it (with) (v.)

1. [1930s+] to have sexual intercourse; either hetero- or homosexual.

2. to appear attractive.

3. [1950s+] (US) to have an orgasm.