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1.
extremely fat or overweight
The lady sitting in front of me is so onomotopactic that she takes up 4 chairs.
by Verna N. September 29, 2006

Words related to onomotopactic

fat obese adipose onomatopoetic pudgy skinny stout thin
 
2.
extremely, extremely fat
Check out that onomotopactic dude! He's like as big as a whale!
by Natashie Blume July 10, 2008