Nah-th-oh; Language of origin unkown; used primarily in the Southern African region. Is believed to be a mix of tamil and Afrikaans (unsure). Word used to describe something disliked or off-putting. Synonyms can include gross, disgusting, repulsive, horrendous, and vile.
"This expired milk tastes natho..."

"I used a public toilet today...it was very natho..."
"When you pick your nose, you're being natho..."
by Musicluvaa June 1, 2012
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