I think readers of this thread need to do a 360 and get out of this thread.
A U-turn is not slang. That's what it's called. And U-turn is how it's spelled (according to Merriam Webster's dictionary).
wouldn't it be a 180?
it's a weird question to begin with. A U turn is a U turn, who wants to use a slang word for that?
I've done too many u-ie? u-ee?