Living high, no matter who or what is trying to keep you down.
"I know Josh doesn't like me, but I don't care. I'm living six feet up in everything"
by Aywhat! July 6, 2017
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When two people have sex in an open grave that has yet to be filled with a coffin or dirt.

Much like the mile high club, but less well known, the six feet under club is difficult to join.
Guy: Would you like to join the six feet under club?

Girl: I don't have to join, but I'll renew my subscription.
by Slyb17 June 25, 2014
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