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"
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