adj. Bloated and obese. Derives from the state of a tick(parasitic insect) after it has gorged itself on a host mammal's blood. Not complimentary. I've heard it in the context of Australian slang, but I'm sure it's spoken all over the place.
by Lulu July 02, 2004
As in after Thanksgiving "I'm bout' fat as a tick"
by E-Rock December 07, 2004