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1: Noun, a companion and helper of The Doctor on the Brittish television show Doctor Who. An omnisexual conman who runs the secret organization Torchwood. After becoming a fixed point in time, he ages very slowly, and eventualy becomes the (SPOILER) Face Of Boe.
2: adj. Someone who is very sexualy active, or makes lots of inapropreate passes, jokes or enjoys such. A boundless flirt.
3: Captian of the Inuendo Squad.
Gwen: Have you ever eaten Alien meat before?

Captian Jack Harkness: Yeah, once.

Gwen: What was it like?

Jack: Well, he enjoyed it!
by CuriousKuro October 02, 2011
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