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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
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Aug 11 Word of the Day
A phrase to describe someone who is cognitively degenerating. Synonym of "going off the deep end". Can have varying degrees of severity.

Reference to the song "Hey You" by Pink Floyd. The line "and the worms ate into his brain" makes no sense in an otherwise linear and literal narration throughout the lyrics.
"My boyfriend has a total case of brain worms. He told me the cat was bugged so the Feds could listen in on us having sex..."

or

"You totally stumbled over that entire sentence. Can't speak English all of a sudden? What, do you have brain worms?"
by _Jez_ October 03, 2009
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3
When a woman or man places her or his rectum against a woman’s vsgina and passes gas into the vagina.
I hear Angelina Jolie is in the hospital with a horrible infection after she and Jennifer Anniston had an accident while “hot air ballooning” last weekend.
by "Don't Poke the Bear" Bear December 10, 2018
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4
The act of blowing inside a woman's vagina to inflate it.
I thought Hot-Air Ballooning was normal until my friends told me otherwise.
by Srzbzns December 10, 2018
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5
When you wear a xxxL t-shirt to take a bm and you pull the bottom over your legs and put your head inside the neck hole so you can enjoy the smell
I walked in on Scott while he was on the toilet and caught him hot air ballooning!
by Mr Moclass November 25, 2016
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