Scarcastic, the verb of scarcasm. See scarcasm.
Alex: Oh, I LOVE being scarcastic.
Kaylin: I hate you.
Mean overly sarcastic comment that deeply hurts people and scars them for life. It may lead them to develop self esteem issues for the rest of their lives and suicidal tendencies.
Dee slapped Mr. F. Patel with a scarcastic comment about his pizza face, and he cried himself to sleep the rest of his life.