A person whose name is either unknown or forgotten(noun)
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Use "whatshisface" in a sentence
"It's like that one date your bookkeeper set you up with, a shlumpy drab dresser with winding breezily delivered stories about pizza delivery and cats and whatshisface and whodidwhatnow and thank god that's over, please pass the tequila."
"We design ourselves a plot synopsis, announce the intended cast and production team, maybe get crazy whatshisface to write something for us."
"I agree with Greg not because I agree with McCain or even think McCain won overall but when it came to the "sitting down" with Achma ... anhadginn ... ol whatshisface, I detected a little defensiveness on Obama's part and McCain went for the red meat jugular that will be parsed ad infinitum for the next 48 hours ..."