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1.
Sudden deterioration in athletic ability or competitive character, often triggered by age or injury.
With his slow start the fans feared their aging superstar was begining to coppage.
by Buddy Grant July 23, 2004
 
2.
amount of fondling that was achieved in a hook-up type situation, as in "cop a feel"
"That girl you talked to all night was slammin'! You get any coppage?"
by tbonk January 20, 2004
 
3.
When the load bears down hard.
"I just missed my train"
"Coppage!"
by Pennoire March 13, 2003