Indulging in any form of sexual intercourse in an in-flight Airplane restroom, while, obviously, being at least a mile off the ground.
"I hope the flight attendant didn't see us come in here...she might know we're becoming members of the Mile High Club."
by Delusional Confusion January 15, 2005

I had consensual missionary sex with my wife in an airplane and we joined the mile-high club. Then I banged the stewardess and got a gold membership.
by Duke January 27, 2003

When I go to Florida in the spring with Mike, we are going to become members of the "Mile High Club".
by SaM* September 28, 2005

Dude, today I became a member of the Mile High Club!
No way!!!
Yeah I boned one of the hot airline attendants!
No way!!!
Yeah I boned one of the hot airline attendants!
by Your new best friend, round 2 January 26, 2011

To have sex in an airplane bathroom, usually when a mile above the ground.
Takes place in almost every airplane to take flight.
Takes place in almost every airplane to take flight.
Dammit, what's with this turbulence? The weather's perfectly calm right now!
(glances at airplane bathroom door)
Oh wait, never mind....
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The Mile High Club is perhaps the easiest club to get into, if you know what I mean.
(glances at airplane bathroom door)
Oh wait, never mind....
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The Mile High Club is perhaps the easiest club to get into, if you know what I mean.
by Hurricane Season June 13, 2009

the hypothetical association of people who have done the sex act in an airplane while it was a mile or more in the air.
by The Return of Light Joker May 25, 2008

by kyoung April 8, 2008
