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"
When a girl rims a guy and while rimming she encloses the colon of the guy completely with her lips and starts blowing out, thus inflating the intestines of the guy.
Did she really give Ryan a Russian hot air balloon in the gym bathroom?