"Music" where the singer shouts at the audience no rhyme or rythem and the guitars all play at extreamely high volumes at the same time. The songs are usually whining about breakups and alienation.
A type Of hardcore music not a sub genre of emo (infact its been around alot longer) and has a big underground following came into existance around the early 90's new bands today include UnerOath, poison the well and hopesfall
the use of emo* like style of music, but with the vocals screeming, hence the combination of screeming and emo makes "screemo". Often is terrible and cosidered to be the worst music genre in exsitance.
*(see emo)