A person who likes to debate online but whose idea of debate consists solely of levying ad hominem attacks until everyone loses interest in debating with her, at which point she declares victory.
OP: Posts something on social media.
Commenter: I disagree with what you said.
Commenter: For real, I disagree. Let's discuss.
Commenter: Why are you ignoring me?

OP: Because I have better things to do than debate online with a known ad hominymph. If I wanted to do something frustrating and pointless, I'd try to solve a Rubik's Cube.
by MrJeMrJeeves September 25, 2017
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