MILF is an acronym for 'Mother I'd Like to Fuck'. In short, it refers to any woman over the age of thirty, with or without children, that is completely fuckable. Made popular by the site MILF Hunter.
A mum (often a friends) who you would do anything to have her taste your prawn. sometimes you try to lick her feet as she walks up the stairs, because your that fucked up.
Dude have you seen stevens dads girlfriend? MAn SHE IS A MILF! I WOULD TOTTALY LET HER SHIT ON ME!