A euphemism for "getting high", aka smoking marijuana. As defined by the comedian Throwing Toasters, referring to The Pheromones singing a cover of the song "High" by Feeder. It was a very funny night!
Where did Michael go? Oh, he's out hot air ballooning with his friends... Don't wait up 'cause he won't be home today.
by izzygalvez January 29, 2009
1 more definition
Farting into the fourskin of a semi erect penis
Brian's fourskin inflated as bob passed wind down his limp shaft. Hot air ballooning
by Sheppytrain June 16, 2013