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1. emo ass
An emo girl that is really easy because of her low self confidence.
I have myspace to get that emo ass.
2. emo ass
(noun); the extremely unflattering result of skinny emo jeans worn improperly OR in the wrong size. They appear to simultaneously sag, expose the upper-crack area and give the wearer a donut of fat around there waist where there may or may not have been one before.
Level of attractiveness decreased by same magnitude as a butterface.
"Yo that girl is kind of hott.."
"Are you WATCHING her leave? She's got an emo ass.."
"Oh.. nevermind."