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1.
Pronounced- Jer (soft J)mon foo. Colloquial. Offensive.

An injection expressing a state of disinterest or lack of caring. Often used in an urban context, this short phrase is uttered when one wants to appear as one does not care about a situation that has just occurred.

Derived from French, and loosely translates from French to English as "I don't give a f**k."
Anne: Aaron called you a nasty name.
Jason: Je m'en fous. Aaron's a bastard.
Anne: You shouldn't swear in public. You never know who might be listening.
Jason: Je m'en fous.
by ihabia July 09, 2004