When you jump on the trampoline naked with someone you like or want to have sex with.
(In video games where you can build) when a player builds a base high in the sky in order to get the high ground advantage over another opposing player with things such as a better view of the player, cover/concealment, sniping point, etc.
Teammate 1: Have you seen the opponent.
Teammate 2: Yah, he’s 100ft in the air skybasing.