Definitions by Harvimus Maximus
bobblehead
An abnormally obnoxious know-it-all, but brainless, individual who always has an answer, or factoid about everything, or "has done that too" but better than you. However, everyone knows better.
There goes that bobblehead Dan saying that, "the store's OPEN sign is in violation of the National Epileptic Association standards!"
bobblehead by Harvimus Maximus October 16, 2007