Someone who has a big head that's full of hot air e.g. Gaston
mostly dumb
"eeww he's SUCH a hot air balloon"
"yeah I can't even stand him"
The sexual act of chewing an excess amount of bubblegum, blowing a bubble around your partner's penis, then jerking them off so they nut inside the bubble.
"Dude, my dad just Hot air ballooned himself into boyfriend status"