Green’s Dictionary of Slang

somersault v.

(Aus. prison/Und.)

1. to reverse one’s plea in court.

[Aus]Canberra Times (ACT) 28 Oct. 40/3: I asked him how he thought he would go. ‘He said he had a good chance of beating King Pedro, but thought he would somersault over Big Philou’ .
[Aus]R. Aven-Bray Ridgey-Didge Oz Jack Lang 45: Somersault Change one’s plea in court.
[Aus]Tupper & Wortley Aus. Prison Sl. Gloss. 🌐 Somersault. 1. To change a plea in court.

2. to happily take both the passive and active roles in homosexual relationships.

[Aus]Tupper & Wortley Aus. Prison Sl. Gloss. 🌐 Somersault. 2. To adapt to either role in a homosexual relationship.