Green’s Dictionary of Slang

1. to make a turn while driving; usu. as bang a U-ie, to make a U-turn etc.

1969		Current Sl. IV:1 4: Bang a U-ey, v. To make a U-turn.
1971		Current Sl. VI.
1994		D. Lehane A Drink Before the War 48: I got off at Beacon Street, U-turned again onto the service road, and banged a quick right onto Revere Street.
2000		Sushi Guide 🌐 Conveniently located right off the Tualatin Valley Highway, Reo’s puts off an aroma that would make you bang a U-ie.
2005		R. Cea No Lights, No Sirens 67: Billy banged a sharp U and came up behind the Chevy.

2. in fig. use, to reverse one’s path.

2000

Inc.com 🌐 It took a small company, Badgett Constructors, in Louisville, to grab the wheel and bang a U-ie with its project-management extranet, called the Internet Contracting, Estimating and Accounting System, or ICEAS for short.