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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-un 

Someone who is just wrong either a sex case,nonce or similar
" the Taff is a wrong-un, spends his rent money on skin mags and 1.50p texts, won't be long until he's up in court again "
wrong-un by John Gaskell April 30, 2006

wrong-un 

(noun) The arse-hole.
(As a verb) Anal sex

See also, "Dry wrong-un," meaning "dry anal sex"
"Oh, yeah! Go up my wrong-un, baby!"
"You know I like (dry) wrong-un, Scotty!"
wrong-un by Bean-o April 30, 2003
To have or try to have anal sex with a woman.
When he gave me a wrong I quietly enjoyed it.
wrong un' by Beater May 12, 2003

wrong-un (n), dry ~ (v) 

Like its name suggests, the term "wrong-un," (taken from cricket jargon) means "wrong one."

It can be used as a transitive verb, which is means "dry anal sex," since it leads to major complications if you try to say "dry wrong-unal sex."

As a noun, the term "wrong-un" is one's arsehole, and the term "dry" doesn't come into play.
As a transitive verb: "Hey, Scotty! I heard ya gave ya woman dry wrong-un!"
As a noun: "Hey, I heard you got some on the week-end, Scotty. Do you do her up the wrong-un? Ha, ha, ha, ha, ha!"