Green’s Dictionary of Slang

to masturbate; thus finger puppet audition n., masturbation.

1999		Roger’s Profanisaurus 3 in Viz 98 Oct. 3: audition the finger puppets v. A single-act, one man show, not suitable for children.
1999–2001		quinnelk T. Rex’s Guide to Life 🌐 Okay, since people don’t want to actually say the m-word and the chicken and monkey phrases have been used to death on MTV, I thought it would be my duty to provide you with a bevy of other useful terminology that may be helpful in this area: [...] auditioning your hand puppet.
2000		Desdemona at www.asstr.org 🌐 Cherry [...] felt sorry for girls who were so naïve that they didn’t know the first thing about parking the pink Cadillac or auditioning your finger puppets.
2001		OnLine Dict. of Playground Sl. 🌐 finger puppet audition v. masturbation.