Green’s Dictionary of Slang

U-ie n.

also U-ee, U-ey, youie

(orig. Aus.) a U-turn; thus chuck/bang a U-ie, to make a U-turn.

[US]Current Sl. III–IV (Cumulation Issue) 7: Bang a U-ey, v. To make a U-turn.
[US]Eble Campus Sl. Mar.
[Aus]C. Bowles G’DAY 59: He gets in the Kingswood, chucks a u-ey and heads back towards the main drag.
[US]Hope College ‘Dict. of New Terms’ [Internet] louee n. Similar to a u-turn, yet this term is used when you turn right to go left. These turns are often referred to as a Michigan turn as well. Slang for a u-turn would be ‘u-ee.’.
[US]J. Stahl Plainclothes Naked (2002) 109: He cruised on by, pulled a U-ey, and tailed her, two cars behind.
[UK]Skepta ‘Not Your Average Joe’ [lyrics] I just come off my two-year ban, I’m still bussing off illegal U-ies in front of the popo.

In phrases

cut a U (v.)

(US) to make a U-turn.

[US]R. Campbell Sweet La-La Land (1999) 118: Dooley cut a U in the middle of the block and headed for the corner of Western and Hollywood Boulevard.
do a U-ie (v.) (also do a U-ey, do a youie)

to make a U-turn.

[UK]N. Barlay Curvy Lovebox 100: The cops do a U-ey in the middle of King’s Cross.
[UK]K. Sampson Outlaws (ms.) 37: With no indication to the cunt I does a sudden big mad youie.
[US]Codella and Bennett Alphaville (2011) 6: Instead of looping around the block I do another U-ey.
1011 ‘Next Up7’ [lyrics] Jakes just passed, hope they don’t do a U-ie.
hang a U-ie (v.) (also hang a U-ey, ...Ulysses, …yoo-ee) [hang v.7 + U-ie n.]

1. (orig. Aus.) to make a U-turn.

[US]Current Sl. II:4 6: Hang a Ulysses, v. To make a U-turn.
CBer’s Handy Atlas/Dictionary 27/2: hang a U - Make a U-turn. The verb ‘hang’ is also used for any turn, as in ‘hang a left.
Online Sl. Dict. [Internet] hang a yoo-ee [...] 2. perform a U-turn. (‘Hang a yoo-ee at the next stoplight.’).
[US](con. 1964–8) J. Ellroy Cold Six Thousand 148: The cab pulled out. The Cab hung a U-ey.

2. to urinate [pun on sense 1 as well as initial letter of SE urinate].

Online Sl. Dict. [Internet] hang a yoo-ee v 1. to urinate. (‘Whoa, hold up, I really gotta hang a yoo-ee!’).