Definition: Unidentified Bitch Ass Nigga; Someone who is unknown and suspicious looking to you and your crew.
Random guy walks into party...
Homeboy: Aye who dat?
You: Ion know, ain never seen him before...
Homeboy: Oh... dat a U-BAN?
You: Mmhhmm
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The best or worst thing you can see. Sometimes it would be a normal friendly ad. Other times, you get these dirty thoughts looking at these smart ads. Seriously, keep it up U r ban dict!
One of the U r ban Dictionary Ads had a hentai supergirl and i'm like "Should I block this ad or just look at it?
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To tell others that they are not allowed to be here.
Also see urban