Green’s Dictionary of Slang

freak v.2

[freak n.1 (7)]

1. to have adventurous sex; to have anal intercourse.

[US]‘Iceberg Slim’ Pimp 58: I was freaking for free.
[US]Lady B ‘To the Beat, Y’all’ [lyrics] I say, you bring the butter and I’ll bring the salt / Anmd if you don’t freak then it ain’t my fault.
[US]T.R. Houser Central Sl. 23: freak, to To have anal intercourse. ‘I do anything for money honey, but I don’t be freakin’.’.
[US]‘Master Pimp’ Pimp’s Rap 52: We must have been freaking for at least 25 minutes. I hadn’t stuck it in yet.
[US]G. Tate Midnight Lightning 85: One of his fetishes was young boys. He would set up these lavish parties so that everybody could just freak together. Weird things used to occur.

2. (US campus, also freak all over, freak on) to dance in a highly sexual manner, to simulate sex on the dance-floor.

[US]P. Munro Sl. U. 83: freak [...] 3. to dance very seductively [...] freak on/freak all over to dance very seductively with.
[US]Hope College ‘Dict. of New Terms’ [Internet] freak v. tr. To dance in close proximity with a member of the opposite sex [...] ‘That guy over there just came over and started freaking me.’.
[US]P. Beatty Sellout (2016) 135: Grinding her pelvic bone rhythmically against his backside and playing with his ears. ‘Freaking,’ we used to call it, and she pranced around [...] caressing the beat.

3. to have sexual intercourse.

[US]N. McCall Makes Me Wanna Holler (1995) 341: We gonna freak this skank when her head gets bad.
[US]Teen Lingo: The Source for Youth Ministry [Internet] freak [...] 3. v. to copulate.
[US]T.I. ‘Let’s Get Away’ [lyrics] [Girl] Hey, let’s get a room, shawty we can freak somethin’ if you down.

4. to excite (sexually).

[US] posting at 8 Nov. [Internet] How do I freak a married man so good that it makes him leave his wife for me?

5. (US drugs) to disguise a marijuana cigarette by wrapping it in a ‘legitimate’ cigar wrapper.

[US]G. Pelecanos Way Home (2009) 145: A joint of weed he had freaked in a Black and Mild wrapper.

In phrases

freak it (v.)

to act in an unrestrained manner.

[US]Big L ‘Ebonics’ [lyrics] I know you like the way I’m freakin’ it / I talk with slang and I’ma never stop speakin’ it.
freak it up (v.)

(US gay) to behave extravagantly, whether sexually or socially.

[US]B. Rodgers Queens’ Vernacular 85: freak it up 1. to be unquestionably gay 2. to attend an orgy, enjoying it to the fullest 3. to be unfettered by social restrictions 4. (exclam) a command to advance: ‘Charge!’ [...] ‘Freak it up, girls: there’s plenty of men for everybody.’.