A Noun, it is used to describe your current opinion or feeling in the most neutral and non-aggressive way to a person who is either Normal, or literallymentally insane.
This neutral word is very helpful, surely.
yea
"Yo bro-ham how it be doing yea?"
"yea"
"Damn hella sicc!"
"Hey you hear about Trump? What opinion?"
"yea"
"OK, epic bigot!"