A Japanese sentence particle that is basically a confirmation-seeker. Intonation gives different meanings. See also ka and yo.

Compared to "ne", this particle is traditionally associated with men, or people trying to sound like gangsters or old school samurai. In this modern day, both sexes do use it, sliding it's association over to a more general aggression, straightforwardness, or crudity. I credit this to the general shape of the mouth used when speaking the "eh" sound compared to the "ah" sound. "Eh" requires a more closed position of jaw and throat, making a higher pitched noise. "Ah" can be vocalized more openly and loudly, leading to a lower and growlier pitch.

Not all the samurai were polite, you know.