(
noun) The person who provides one with something; usually
drugs,
alcohol,
pirated software, answers to a
final, or something similiarly
illicit.
For example:
Who's your hook up for this awesome shit?
(noun) The stuff that your hook up provides you with.
As in: Hey, did you get the hook up yet?
(verb) To be the hook up and provide someone with a hook up.
For example: John's hook up hooked him up with the hook up.