A superlative term used majorly in the online gaming community, describing victorious cry of the enemy player as his gaming skills outstand skills of the other player. This is commonly used when the other player frags its enemy player in a concentrated ratio. The original term is Owned, but since the l337 speech, it is spelled with a zero and a deliberate mistype (just like in the word teh) with a p on the beginning.
Mufflowne is a madeup animal by Aleks Vujovic which quickly became popular in the community. The creature is very small, about 7 cm in height (including ears) with a bipedal structure, fur and the ability of gliding short distances. It is often described as a North-American flyng squirrel and a bunny rabbit cross. It has very flexible bones, indegistible apetite for sexual intercourse and as a general rule it is very cute.
It has nothing whatsoever to do with the word muff apart from it's first 4 letters.