3 Munf is an expression that can be commonly used among schoolboys alike, can be used as a way of showing anger or frustration, it can also be used as a derogatory term, similar to wanker or twat, but its mainly for scruffy people with a buzzcut and short blonde people. Can be derogatory if used in the wrong way, an exemplar being "You 3 munf twat". This would be the equivalent of calling someone a "Twat"
"Hey, you scruffy 3 munf.'
or
Say you drop a glass dish and it smashed, you could shout "3 MUNF", everyone would understand that its used in the way to express anger.
An often handsome, well mannered and well-spoken person of Yiddish Decent. Characterized by their Thriftiness, Munfredos often posses a larger than average nose, and ruggedly handsomefeatures. Munfredos are known to possess a large following of female admirers.