A greeting. Brought into use by Poppy L.
Variances: Can use as many o's as desired.

Rahoo is a greeting. It can really mean anything. You can use it if you don't know, if you don't want the person who ask you how you are to know, or just being random.
It's a good word, very good word.

verb: (1) to hype something in a fake, cocky, or suck-uppy manner, (2) attempt to make a dishonest or exaggerated statement seem correct through excitement;

General greeting or answer to "What's Up": used as hello, but in the barrio; or most often rahooo = "I am a douchebag"