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1.
A Blenge is a term for an item which is being described as possessing both the qualities of a Bellend and a Minge, but not in a positive way.
Most regularly used to describe someone who has done something either idiotic or rancid in an insulting manner.

Pronounced:-
Bl-en-juh
Don't bother talking to Dave, he's being a complete Blenge.
by Joooooosh February 09, 2010
 
2.
'Blenge' is a cool Limavady saying for 'punch'
jesus sur i hit that boy there a quer BLENGE in his we face
by chris hunter July 12, 2006