high on air

It is when you are having a long day that you go mentally insane. For an example: having a long day at school, then when you are talking, the littlest things make you laugh and the dumbest things, like a number and a word make you die of laughter. It is quite common to happen with friends after work or school. It is very likely that when you have it people around you get it as well.

High on air example
Friend: yeah I did math today. I found out that x is a variable.
You: HAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHA. X. HAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHA

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