Top Definition
No Apparent Reason Titty Hard-On

The equivalent of a Narby or Narb, but for a girl, where for no reason their nipples harden.
sally: OMG I was sitting in gym and all of a sudden i got nartho, I was so embarrassed!
#narth #nartho #narth-o #narb #narby
by Danny Guthrie June 02, 2008
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