The act of using two dildos (one in each hand) to penetrate a girl orally and anally (vaginally if you please) in a systematic time frame , such as the ticking of a metronome.
Tim: Dude what did you do last night?
Chris: Not much , my balls kinda hurt so I just pulled a metronome
on this chick. It was perfect , she didn't know what hit her.
Tim: Nice , I'll have to try that next time.