(n.) acronym: stands for "uber cunt douche fuck". It describes a guy who is an absolute user and/or man-whore. This guy will drive his girlfriend or friend with benefits (fwb) to the brink of insanity. He is defined as an asshole who somehow is not the most attractive, yet girls still want him. Usually resembles "not-so-well-known" Disney characters (i.e. Timon, Crickie, and Jack Skellington).
"OMG ur ex boyfriend was a total UCDF!"
"the pale sketchy one that looked like a bad mockery of Jack Skellington"
"Oh yeah, he is a UCDF!"