The male version of the derogate term "slut". A man who would, without question, do absolutely anything he could for sexual relief, including but not limited to having sex with inanimate objects made in the likeness of a woman. Inspired from the sex-crazed pervert by the same name on the show "Family Guy".
"Don't date that guy. He's a fucking quagmire." "I wouldn't leave my sister alone in the room with a quagmire like him."