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1.
same meaning as whats happening? usually means wut is going on?
eyyyyyy cheaaaaaa whats hannenin? East side squad whats hannenin? Hey Faven, Whats Hannenin?
by be EZ March 20, 2006
 
2.
the title of the most annoying song ever produced under the genre of "hip-hop" by none other than the (opinion) worst rapper ever, Soulja Boy.

ghetto way of saying Whats Happening, which means whats up.
Soulja Boy: "whats hannenin whats hannenin whats hannenin whats hannenin whats hannenin whats hannenin whats hannenin whats hannenin......"

Drake: Yo, nothin much brotha, jus seein my girl with her sweatpants hair tied chillin with no make up on...and by the way I think i got tha question the first time you said it.
by RRRRRZKKKKK June 29, 2009