On Chunk 

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".

On Chunk I didn't take your money.

On Chunk by On Chunk July 11, 2009

Keep on chunking 

When you leave the bathroom but you suddenly feel like you still need to poop.

"What took you so long?"
-"Sorry, when I got out I felt like I needed to keep on chunking"

Keep on chunking by Voxolotl September 23, 2016