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when one slips up in a conversation and eat their own words.
Luke told Jen that she hates Canadians. Jen then told Luke that she is actually a Canadian. Open mouth, insert foot.

I told Sam I'd bang Darren's wife 'cause she is so hot, when Darren was actually behind me the whole time. I practically opened my mouth and inserted my foot there.
by Baz S. October 04, 2007