cracking up

Bursting into a prolonged fit of intense, uncontrollable laughter. Instigating this sort of reaction in someone is called "Cracking that person up."
John told me a hilarious joke the other day and I started cracking up.
by lollylollylollyPOP!!! July 24, 2009
mugGet the cracking upmug.
A word that's so long that I had to make a space within it so the example for this definition would be accepted. What's more, it's the longest word in the English language. Basically, pneumonoultramicropscopicsilicovolcano coniosis a lung disease caused by breathing in particles of siliceous volcanic dust. Invented by some guy who had too much time on his hands and wanted to make history by creating the longest word ever.
Doctor: Sir, I am afraid you have come down with a severe case of pneumonoultramicropscopicsilicovolcano coniosis due to exposure to volcanic dust.

Patient: WTF!?!?!?!?

Me: I feel your pain, dude...I feel your pain.
by lollylollylollyPOP!!! July 15, 2007
mugGet the pneumonoultramicropscopicsilicovolcano coniosismug.