1) an internet information source with written entries from people. they must be approved by the managers before they are posted. can often have incorrect entries. i wouldn't trust it as a project information source.
2) used in fake gang banter for people who use wikipedia as a main information source and love it.
"yeah, man. i used wikipedia for my john adams history project and i got an F."
**Jamie throws up West-Side Fingers**
Jamie: "Wiki-Wiki, yeaa boii!"