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1.
Something you say when you cannot remember or be bothered to say what it is someone has.
Yeah, Tim is over there with his new whatsit
by Cleo Byrd July 23, 2008
 
2.
A slang term for feces, which originated in Homestar Runner as a euphemism for the substance that The Poopsmith shovels.
"I keep telling him the sun don't rise and set on that pile of whatsit, but he don't want to listen!" -The King of Town
by JohnnyLurg March 15, 2011
 
3.
What's good, what's up, what's new
-What's it?
-Jackshit, I'm bored
by princZess420 February 17, 2004