an extremely wordy and detailed definition defining words on urbandictionary.com

A small but enthusiastic sub-set of kinky sex culture that enjoys pornographic material depicting people dressed as clowns defecating often but not always in a public setting.

When someone asks you to do a favor, and you don't plan on doing it, you say def for sure and gradually walk away like nothing happened

Shortened form of "definetly possibly". Since anyone that says "definetly possibly" sounds like a complete fool, someone came up with "def poss". Doesn't really save much time in speech, but it does save a person's reputation. The advantage of saying "def poss" as opposed to "possibly" or even "poss" for that matter is the fact that "def poss" implies that is a serious possibility, rather than someone just teasing with a half-hearted "possibly".

A contraction between the word definitely and the phrase "for sure". Used as assurance, reassurance, confirmation, acceptance, affirmation, encouragement, agreement, and many more.

One of the most succesful labels out there for independent/underground hip hop. Founded by El-p, and has a big roster of original underground talent.
Best 2 check out are Mr. Lif, Murs, Aesop Rock, and El-p! These rappers are
so original that they make most mainstream rap look like nothin. Nuff said, Def Jux is a label 2 check out.