A term used mainly by African Americans but also by other races below the poverty line. Translated into english, it means "all right?". It can be used as a question or at the end of every sentence (although most people use it at the end of every sentence).
Ebonics: nigga u aight nigga?
Translation: Hey, are you all right?
Ebonics: nigga u getwhatimsayin, dis crib be tricked out, aight nigga
Translation: This house is very well furnished, all right.
When a mf say some crazy ass shit and you don't know what else to say. This sentence is usually followed up by you leaving the convo or beating the dudes ass.
Bob: "Yo I fucked yo girl last night and she said my dick was better than yours"