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The opposite of the mile high club, where the requirement for membership is to have sex below the surface of the earth. Also applies to submarines.
Guy #1: I heard he went spelunking with his girlfriend last week. Apparently he joined the Mile Low Club.

Guy #2: Aww yeah I'd explore her cave alllllll night long.
Nazi Soldier #1: U-Boat 96 just got back. I heard the captain joined the MLC while they were at sea, chicka chicka yeah chicka chicka.

Nazi Soldier #2: Nasty dude, that was an all-male expedition!
by arrivez à l'helico February 11, 2010
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A much less glamorous version of the mile high club. If you've ever jerked off on a plane then then you're in the mile low club.
Trent: Yo did you just crank one out in the airplane toilet?

Albert: Yeah (hangs head in shame)

That's low dude. You're in the mile low club now.
by JohnnyRico77 February 22, 2009
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basicly the opposite of the mile high club your just in a submarine instead of an airplane
"hey man guess what i did!" "What?" "became a member of the mile low club!" "no way!"
by zciwonadz October 15, 2008
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