MILF, an acronym for "Mother/Mom/Mum I'd Like to Fuck", is a colloquial term common in English and generally regarded as vulgar when spelled out. It denotes a sexually attractive female, usually several years older than the person using the term.

History

The term itself was first documented in Internet newsgroups during the 1990s. It was popularized by the 1999 film American Pie referring to Jennifer Coolidge's character, "Stifler's mom".

The concept of a MILF predates the term itself, as exemplified by Mrs. Robinson in the 1967 comedy classic The Graduate.

(source: WiKiPedia)