Umm, it could not be simpler. "Holla" means "holler"... which means "to shout".
If you want to be all ghetto about it then you can use it somewhat inappropriately within a conversation to the effect of: "please reply", or "talk to me".
Colloquialism: "Hey dogg, I know dat you be cool wit' THOSE cats, why don't you holla at yo' boyz?!"
Text Message: "wut b gwanin? i b cotchin in da toilet. u goin to da club l8r? tb/holla back xxx"
by Pauric January 2, 2006
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what u say when you endin a convo
I'll holla
or holla back youngin
by Juicy August 5, 2004
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it's slang, y'know "holla." Actually it's much less complicated then everyone is making it out to be. It can be traced way back to Marvin Gaye: Inner City Blues (Make me wanna holla)...think about it.
Etiquette dictates that if i holla at you, holla back
by dinc September 22, 2005
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correctly spelled 'Hollaback', a word made up by Christina Aguilera that subsequnetly has no uniform definition.

I suppose it is said to gain attention, or do something once more. It might also mean 'scream backward', which makes little sense in and of itself.
Person #1: I Listen to the song Holla Back girl yesterday, I think my ears are still bleeding.
Person #2: Why can't Christina Aguilera die already?
by Larry F. Malarkie October 27, 2007
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Reciprocating oral sex, going down on someone after they go down on you.
If I'm going to blow him, I expect him to holla back.
by Pagan Marbury July 20, 2006
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An expression used when departing. Can be used interchangeably with the words "i'll holla 'atcha", "later", or "bye". Was originally brought into existance by some douche bag from the "The White Rapper Show" on VH1.
Trey: Aight nigga, I'm finuh dip.
BJ: Alright son, hollalujah holla back. 1.
Trey: 1.

Mike: All y'all niggas don't no! We gitten da fuck outta hea.
Ryan: Hollalujah holla back, nigga.
by silverstreaks2004 December 20, 2009
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