WILLOW: She’s like this cleavagey slutbomb walking around going, “Ooh, check me out. I’m wicked cool. I’m five-by-five.”
TARA: Five-by-five? Five what by five what?
WILLOW: See, that’s the thing. No one knows.

(Other Authors and Sources)

Buffy the Vampire Slayer, “This Year’s Girl”