Green’s Dictionary of Slang

get up v.1

1. [late 18C+] to penetrate sexually (whether the vagina or anus).

2. [1980s+] (also get around, ...over, ...the name out) of a graffiti artist, to inscribe one’s name or signature.

3. [1990s+] (Aus.) to beat, to get the better of.

In phrases

get oneself up (v.)

1. [mid–late 19C] to dress up.

2. [1970s] to prepare oneself emotionally.

get up off (v.) [1930s–50s] (US black)

1. to experience the effects of a drug.

2. to resist a way of doing things.

3. to give up something important or valuable.

4. to make oneself sexually available.

5. to refrain from gossiping about a third party.

get up (on) (v.)

[1960s+] (US black) to get excited by, to become interested in; as a command to become aware, ‘get wise,’ or with n., to act.

get up with (v.) [1970s+] (US black/campus)

1. to meet someone; to get in touch with.

2. to have a romantic encounter; to have sexual intercourse.

3. to fight.

SE in slang uses

In phrases

get up and get

see separate entries.

get up in (v.)

[1990s+] (US black/prison) to interfere in, to force oneself upon, to fig. enter where one is unwelcome/forbidden.