Acronym, "First Lady I'd Like to Fuck".
Refers to any wife of the President whose physical attributes make one want to take her to bed and sex her up.
Coined by "The Daily Show" with Jon Stewart.
Dude 1: Fred Thompson's wife Jeri Kehn is a total FLILF.
Dude 2: Actually, the '08 election is starting to look like a FLILF festival.