Top Definition
A 'cleaner' version of Motherfucker, without the "fucker". However, the term is used as if you were simply saying 'damn' or 'fuck', not as if you were saying MF.

This is often heard in very conservative boarding schools, where the students are warned not to use any explicit language, or severe consequences will follow.
1. "Mother Eff", I got an F in that English paper.
2. mom- "GO TAKE OUT THE GARBAGE"
son- "Right while I was watching the mighty boosh, Mother Eff"
3. "Mother Eff", that sucks.
by weareallmadeofstars July 02, 2009

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