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To enter a conversation in progress, the subject of which you know nothing about, and subsequently derail the discussion with an irrelevant opinion.
"We were having the most enlightening discussion about Futanari when this bro rolled up, and I just knew he was going to doonch."

"I bet they are having an interesting conversation, but I am afraid I will doonch."

"The ice cream social seemed to be going so well, that is until Mr. Chucklefuck had to come along and doonch literally every conversation he could find."
by anon1235813 January 12, 2012
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