2. Can be used in the place of 'shit'.
"Who says that?"
2. Can also be used in place of "gash". Originated from under graduate level geology banter. Standard of Schist is graded from low grade, medium grade to high grade, with an exceptional standard having the pre-fix "foliated".
Get that dirty low grade schist out of my face.
Dude: I got a dollar on it
Me: cmon man stop being so schist
Me: Hey have you seen my wallet anywhere
Friend: Na man hit up Joe he just left maybe he saw it
Me: He isn't answering
Friend: Dam that's schist