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1.
1. A particular form of matter that is extra disgusting or unpleasant; something that is utterly repulsive.

Also related: Yuck, Yuckedy yuck, and yuckula yuck.
1. I took a shit and it smelled like yuckula.
2. He woke up and his breath smelled like yuckula.
by Johnorama June 07, 2009