To drink someone under the coffin 

1) when someone tries to keep pace with your drinking rate (usually alcohol); however, they are unable to handle it, so they pass out and almost certainly die.

2) a much more serious and stronger version of “to drink someone under the table”

Ricky: “Bobby claimed to be able to chug more tequila then I could, so I drank that bitch under the coffin!”

Austin: “damn I’ll make sure to send flowers to his widow.”

A example of how to drink someone under the coffin

To drink someone under the coffin by Kappa Kappa 133 October 15, 2019