The art of pulling your girlfriend to the corner of the bed during the tail part of intercourse in order to gain leverage on her g-spot to make her cum.
Debbie: So, how was he last night?
Anna: He was so amazing, he even performed the coffin corner for me. It was splendid
Debbie: Wow! He must really like you! What a gentlemen!
The back corner of a truck, such as a dumptruck or flatbed, when hit directly by a crashing vehicle.
They lost control of the vehicle on the highway going only 40mph, it wasn't for the fact they hit the coffin corner of that truck they should have made it.
A hardo is a person who tries extremely hard at everything. Most times a hardo will try very hard at things that do not require excessive effort. For example, sports practices, gym class, etc.
Wow did you see Jack at practice today? What a hardo!