Jackals belong to the family Canidae, along with dogs and are very similar to coyotes. Jackals are omnivores and scavengers. They are adapted to hunting small prey such as small mammals, birds and reptiles.

An unathletic, freeloading valueless student at the University of Chicago, distinguished by their pretentiousness, self-entitlement, and general air of douchebaggery.

A slightly migratory species, jackals inhabit the library during finals week, the dining hall during feeding times, and hibernate in their dorms in between. Unlike their territorial namesake, jackals are completely oblivious of others. They create large messes and romp about at all hours of the night, showing utter disregard towards athletes and people with worthwhile goals.

Unsavory people who won't hesitate to rob or kill you for your paper. Usually come out at night.

A dievious or mishchievous person; someone who wishes ill-fate upon another.

in Stewie Griffin's game of Pictionary with the neighbors

A guy who pretends to be your girlfriends guy friend but he is just waiting for a chance to steel her. He will cause arguments between you two and then say you are a jerk for being mad about her having friends....then the scumbag will always be there listening to her complain about you. And when you both break up he moves in on your girl.

Derived from a man in South Philly who lived in the neighborhood but nobody knew him and he always looked like he was up to something. Neighbors would refer to him as the Jackal. The term Jackal was then coined and can be meant to explain someone that is always up to no good.