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The conversational equivalent of photobombing. Usually unintentional, the perpetrator is just a fuckwit. An unwanted guest who takes over the conversation and cannot be persuaded to leave directly or otherwise.
" Jane: Hey, so I was talking to Rachel the other day and she said her and Todd slept together"

Linda: Are you serious tha-

Alice: HEY GUYS! can you believe the economy these days...(proceeds 10min speech on world economy)

Jane: DUDE! You're totally convo-bombing! GTFO!!

Alice continues...
by Patricia765 August 07, 2011