bup-bup-bup

exclamation2

1. •
   (informal) An exclamation conveying a meaning equivalent to "wait"!

   • Bup-bup-bup! Don't go just yet. You forgot something.
2. •
   (informal) Representing projectiles being shot.

   • So the Sicilian comes out in me and I want to get the lupara, the short-barreled Sicilian shotgun, and just go ‘bup-bup-bup-bup.’ — 1992