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When a man dates a woman that is way older than a cougar or milf. Casket Robber is the antonym for Cradle Robber.
A 23 year old man trying to get in the pants of a 65 year old woman.

Yo Damn, Doug! That lady is old enough to be your grandma! Quit trying to be a damned Casket Robber! Sicko..
by MagicManMike December 30, 2009
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2
When somone dates another person who is older then they are.
Friend: Dude how is your girlfriend? Aren't you only 18?
Guy: Yeah, she's 21!!
Friend: Dude your a fucking Casket-Robber
by CabaltheWolf May 28, 2007
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