Top Definition
A form asphixiation where two people having intercourse on a mountain top or at a high altitude enter a euphoric state due to a lack oxygen reaching the brain yet continue on adding a strange twist to ones orgasm....
1st guy: dude Mountainsex is awesome...

paramedic: he's fading fast!

1st guy: dude.....
by Cravendale September 21, 2008
7 Words related to [Mountainsex]

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