MILF: Acronym. Abbreviation of the phrase "Mom I'd Like to Fuck" popularized by the film American Pie.

Me-ow! Not to be crass or anything, but is Susan Sarandon totally one smoking hot MILF or what?! You work that black brassiere, Ms. S! Oh, I suppose Eva Amurri is okay, too. Maybe if she's lucky, someday she'll mature into a foxy old cougar like her mom.