Having sex on the train including the subway
I bought an Amtrak ticket from Texas to Michigan and fucked this chick and joined the Steel Mile Club.
Contrary to popular belief, *this* definition refers to the most difficult, rage-inducing Veteran mission from Call of Duty 4: Modern Warfare. Mile High Club is the epilogue to CoD 4, and attempting to complete it on Veteran is wishing for death's sweet release after only about 5 attempts.
"I've broken 3 controllers trying to beat Mile High Club."