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1.
An ass that's so fat, you only see a small part of their thong.
"Man! There's somethong wrong with her!"

"Check out her somethong!"
by Randomisationizm December 29, 2012
 
2.
Something wrong, something that is so wrong to change the essence of the original meaning.
Where I can shit? Somethong cause my crap!
by Roberto Piangatelli September 19, 2007