An annoying person who answers all questions (sometimes with the correct information, sometimes with complete bull) regardless of whether the question was directed at them.

Someone who as "all the answers" and hence can be described as a bag full of answers, or "answerbag"
"That Jane is such an answerbag.."

"Was I talking to you, answerbag?"

"I swear if he tells me one more fact about cheese making, I'm going to headbutt that answerbag"
by Brozzie March 15, 2010
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