A term playing off of MILF (Mother I'd Like to Fuck) except the G stands for one of many things: Grandmother, Grandfather, Girl, or Guy. As such it can be used as a gender neutral term.
"Damn that dude is such a GILF, I'd pay money for a piece of that change"
OR
"Holy shit that old lady must bathe in the fountain of youth, totally a GILF"
That guy? The one that destroyed the planet Jupiter? Yeah HE'S a gilf.
When you’ve stepped it up and no longer do Milfs = (mothers I love 2 fuck) but I’m doing GILFs= grandmothers I love 2fucki
I hilt that gilfs pussy like no tomorrow
Grandparent I’d Like to Fuck. Just like MILF or DILF except with a grandma or grandpa.
Someone who is a grandparent (or at least old enough to be one), but still very attractive and fit. Bonus points if their hair is gray or white and they’re visibly old, like a Silver Fox.
Generally they are at least 50 years old, even though it’s possible to become a grandparent in your 40s.
Teenager watching Doctor Who in the early 70s:
The Third Doctor is such a GILF! I hope I look as good as him when I’m old!
G.i.l.f gay person I'd like to fuck
Brook: I wolud so fuck that girl
Abby: she is your gilf gay person I'd like to
fuck
A Gilf is your best friend that spoils you and gives anything you ask for