A term used in St. Louis by African-Americans, meaning "I swear". Rumor has it that the term originated from a man named "Chunk" dying in a car accident, hence the term "On Chunk's Grave."

Variations include "On my Momma", "On Me", and "On Jesus" or just "Chunk".

When some little bitchboy is acting like a little tiny pee pee poo poo baby and messing up the group plans.