Top Definition
to go off topic in a forum debate so the original topic is no longer under discussion & the threadnapping reply has now become the subject to replies, leaving the original topic long forgotten or buried out of significance.
Typical of him to threadnap yet another debate - it was supposed to be on the subject of motor problems and he posts irrelevant replies and now other people have too.Damned Threadnappers
by Fred Nappa November 30, 2013

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