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A thread stopper is when someone writes such a good and/or long opinion in a forum, (or a definition on Urban Dictionary) that everybody else wants to match them but in the end doesn't write another opinion/definition because they can't write another one better! See star fox and also desert eagle
"Dude! That thread stopper stopped me from trying to outmatch cuz I knew I couldn't"
"Far out man"
by Hawke June 09, 2005
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