Top Definition
Relatively a thong but a thOMG is a thong that someone would say "Oh My God" to, for the better or for the worse...
Damn, megan Fox is wearing that two inch thOMG that barely covers anything!!!!!

EWWWWWW Your fat mom is wearing a thOMG that is WAAAAAAAY to revealing.
by Dicktionmastah January 28, 2011

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