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An extremely think goo that is found in unknown cracks and crevices.
Odo is inside my cracks and crevices.
by Odomus August 05, 2010
Any substance that has a gooey, thick, or slimy consistency. Much like Nickelodeon's Gak.
1. He reached into the lake and pulled out a big ball of odo.

2. The paint can was not stirred well, so a big pile of odo ended up at the bottom.
by ChronoTraveler March 13, 2005