An extremely over the top Emo. A "super-emo". Just as Emos are seen as an overtly unnecessary extension of Goth, Heamos are overtly unnecessary extensions of Emos.The expression of emotion and the dramatic theatrics that accompany it are so heavy and so blatant, that Emo is not enough to describe it. Heamo is used as an abbreviated combination of "heavy emotions"
"Hey, did you see those Emo kids at the concert?"
"Man, they weren't Emo, those kids were Heamo!"