1) a berating, downing insult
2) A Straight person that displays homosexual tendencies
3) a person that has tendency to be dirty,unclean and dishevilled
4) any combination of the above
"Come here assmuff..."
An insulting term (invented while under various controlled substances) can be used to refer to basically anything you don't like... or things you really do like. It doesn't really matter as long as you deliver the word in a british accent.
SUCKS TO YOUR ASSMUFF!
I lost my assmuff last weekend!
BLOODY 'ELL YOU DIRTY ASSMUFF