Green’s Dictionary of Slang

1. (orig. Aus.) to masturbate.

1950		‘No 35’ Argot in Simes DAUS 84/1: flip (oneself off) To masturbate.
1967		Rugby Songs 127: And as he got older and bolder and bolder, / And took himself in hand, / And flipped and flipped and flipped and flipped, / To the tune of an army band [Simes:DLSS].
1984		Partridge DSUE (8th edn) 407/1: late C.19–20.
1990		Tupper & Wortley Aus. Prison Sl. Gloss. 🌐 Flip. 1. To masturbate.

2. (US) to hand over, to give.

1933		J. Spenser Limey 95: If I go and sob on his doorstep he’ll maybe flip me a couple o’ hundred bucks.
1960		J.D. Macdonald Slam the Big Door (1961) 123: I’m not flipping you a four-bit-piece to stop singing.

3. to make a sign; usu. in flip a/the bird under bird n.²

1982		(con. 1970) J.M. Del Vecchio 13th Valley (1983) 373: Peace marches [...] Everybody standin round flippin each other peace signs.
1982		J. Ellroy Clandestine 300: I [...] tripped over an old man, naked from the waist up [...] He cursed me and feebly flipped me the finger.
1993		H. Prejean Dead Man Walking 131: Many people [...] energetically signal their response to our cause: they put thumbs down; they flip us the middle finger; they shout ‘Fry the bastards’ .

4. (US black) to make, to create, e.g. a marijuana cigarette, or a rap song.

1993		Source Dec. 43: It’s about being able to flip lyrics and beats they way they should be flipped.
2000		Ebonics Primer at www.dolemite.com 🌐 flip Definition: 1. to roll a blunt. [...] Example 1: Yo, who gonna flip the next el?