Sexual preferences that are geared toward no specific group or fetish but towards pretty much anything. Often practiced by someone who's sexual tensions are high and who's standards are low. Best described by a particular button which reads I'd have sex with anything that moves right now, but why limit myself'.

A person who is omnisexual.
Basically, it's a broad term used to refer to any and all sexual orientations, expressions, and so forth. From homosexuals, to transgenders, to sometimes people with foot fetishes, someone who is omnisexual will love you for who you are.
(Based off my own definition of the term)

Someone or thing that will have sexual activities with anything.

one who proudly distributes his/her sexual affection over a broad range of places, people, and at various events..from "omni" meaning "to be everywhere at once" and "sexual" meaning "sexual"

not to be confused with the heralded Omnisexual: one who distributes his/her sexual affection in and around the Atlanta area esp. near the Omni arena and recently any other arena in the area

One who will have sexual relations with anything: male, female, intersex, androgynous, animal, child.

Not to be confused with pansexual, which differs slightly, though they are often considered synonyms.

Being sexually attracted to everything- men, women, children, animals, the dead, your family, fire, a chair. Being able to, at least at times, be sexually attracted to basically anything your mind can come up with. "Omni" means "all".

Omnisexual: (adj.) 1. Capable of performing every possible feat of reproduction 2. Able to reproduce with anything, even your bitch-ass ugly mother.