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A wrong 'un is a phrase used to describe someone or an action someone has undertaken that you disapprove of. It is not offensive merely an expression. Probably originates from the Midlands in England.
Billy-Bob ''I did 4 grams of coke last night!''
Jimmy-Joe ''You're a wrong 'un, you are!''
Wrong 'un by INeedPRN May 26, 2008

wrong'un 

A person who has evidently sacrificed his/her soul to the god of hedonism.
That guy's a complete wrong'un, he takes cocaine for breakfast.
wrong'un by gaolferry June 7, 2009

wrong window 

a 'wrong window' is basically the act of sending a message accidentally to the wrong person in chat or in IM because you accidentally type in the wrong convo window. you usually say thereafter 'oops wrong window'.
this could lead to being quite fucked on your part, on certain occasions.

also, doing this intentionally for bets can prove to be a quite fun game. it's like getting yourself into a fucky situation for money.
for example, you send a porn link to your girlfriend in msn messenger when it was really directed to your buddy.

friend: How's the family?
me: not bad, yourself?
friend: Very well.
me: oh man check guys this hot porn torrent i found: server.blah.com.ass?file=232
me: ...oh shit. fuck!
friend: EWWW you sick person! what are you doing!?

WRONG HOLE ! 

When you put or dick or whatever in the wrong hole
WRONG HOLE ! by AVANTAE BROOK$ August 9, 2016

wrong-foot 

(verb) to wrong-foot someone means to manipulate the situation to make an innocent person look bad, guilty. or inept. Often used by sly people to deflect the blame they deserve onto someone else, or to win a promotion at work, or to steal someone else's mate by making their rival look less desireable.
"Charlie was scamming hundreds of dollars on his expense account -- but when I pointed this out to the boss, Charlie wrong-footed me and somehow I got the blame! Unbelieveable!"
OR
Denise knew the end of her relationship with Joe was coming when Charlene wrong-footed her, telling a party story that made it look like Denise got drunk when she hadn't...which just happens to be one of Joe's freakout points.
wrong-foot by liv4mntns October 8, 2009

Wrong Mower 

1.When someone is consecutively wrong on a test or some other sort of exam.
Example:
1.Larry: Dude I missed the last 10 questions on my Calc test!

Albert:Yeah you just got wrong mowered right there.

2. Teacher: And Tony, what do you think the answer is?
Tony: C. Actually no, wait D. No... Its gotta be A
Teacher: Well umm actually the answer is B.
Me: Wrong mowered
Wrong Mower by Albert Pineda September 16, 2009