offesive slang term referring to anything related to emo, hardcore, screamo etc. can be used to describe pretty much anything or as a noun used in place of the genre.
1. "You ever heard of Burning Black Tears That I Cried?"
"Yeah, they're pretty shrill."
2. Look at that really shrill kid over there
3. I saw these kids listening to some shrill and fighting the air
The act of reaching high picthed sounds when in distress, getting excited, or just when being annoying. It can be used as a noun, verb, or anything else.
"MJ keeps shrilling around the house."
"Why doesn't someone tell her to shut up?"
"Don't get shrill with me, MJ."
"She shrilled the shit out of me."