What's "U-y" in english?

Hi,

I've got a sentence:

"'Isn't there something we can do?' Emily pleads, getting so impatient with the accelerator that I think for a minute she's going to pull U-y and head stright back to The Strip."

I don't know what "U-y" is... I can't find it anywhere, in any dictionary... Same is with "pit-stop" and "let's floor it!". I'd be grateful if somebody would explain it to me.

pit stop
1. an occasion when a driver in a race stops for a few seconds to get fuel or let people repair the car
2. /MAINLY AMERICAN/ a short stop during a long car ride, in order to get food or use a toilet

by Macmillan E.D.

U turn

http://dictionary.cambridge.org/define.asp?key=87569&dict=CALD

"let's floor it!" - pedal to the metal, full acceleration, let's go flat out: gaz do dechy