Top Definition
A gooey substance used to amuse young children, ranging from 5th grade-college-aged people with no life. Composed of corn starch and water.
"Dude, remember in fifth grade when we made oobleck? Let's get high and make it tonight!"

"Dude, that chicken chimichanga was so far from dank, it tasted like oobleck."
by Seymore Butts. February 04, 2006

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