an exclamation, mainly used under two circumstances:
1. unbearable rudeness
2. unbearable absurdity
example one:

Margot: Man, I love getting to use the 10 Items or Less Lane at the grocery store!
(Franny cuts in front of her in line and proceeds to unload her full cart of groceries)
Franny: (to Margot) Sorry dear, I'm a little over the limit.
Margot: (to self) ...beep...beep, SHUT THE FUCK UP!

example two:

Zach: (watching Dancing With the Stars) Is that really Slater from Saved By the Bell dancing the tango?

Michelle: BEEP BEEP shut the FUCK up!
by Alexxxandra November 30, 2006
Get the beep beep shut the FUCK up mug.