mason: yo andrew! your grandma is a total gilf!
andrew: what the fuck does that even mean
Grandmother/Grandfather I’d Like to Fuck
Person 1: Bro did you see that guy? He’s a GILF.
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.