1 definition by rmsiii
A third party who "ninjas" their way into a conversation they were not originally a part, usually with a comment which mean they have been eavesdropping for an extended period of time, like a ninja striking in the shadows.
Jackie just pulled a conversation ninja. I didn't even notice her before she dropped that comment about her Lexus while we were talking about luxury cars.
by rmsiii November 15, 2007