A person whose only reason to participate on an Internet discussion board is to argue and be combative, oftentimes joining just to add a pointless but hurtfull comment then to leave never to be heard from again until the topic nearly dies out and then jump back in to fan the flames. They seldom if ever add anything of substance to any discussion they participate in, but instead just troll various forums looking for a fight -- stirring the pot with no rhyme or reason.
Tread1 is the king of the keyboard cowboys.
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