Rum 'un 

Used in Manchester, England to mean a naughty or mischievous person, usually a child.
From "Rum one".

You want to watch yourself leaving that cake mixture where Jimmy can get his hands on it, he's a right little rum 'un.

Rum 'un by TheHunt January 24, 2014

mobbed a rum'un

A phrase from the Norfolk dialect used to describe when somone has made a lot of fuss.

"stop crockin boi yer mobbed a rum'un over nufin an you got evryone else all a puckaterry"

mobbed a rum'un by king slop August 26, 2007

rumun 

a term used alot in wisbech, fenland, and norfolk by farmery people and general pikeys/ peasnts/ commoners, which means odd/ strange or good, depending on the situation used.

he's a rumun that lad: either he is a good lad or hes a bad lad

rumun by lawrence daniels April 24, 2006