"Smooth move" is a sarcastic comment in response to a stupid or crass action and "exlax" is a pejorative reference to the perpetrator of such action. The whole term comes, of course, from the fact that Exlax enables smooth bowel movements.<br /><br />The insulting capability of "smooth move exlax" runs the gamut from a mild put down (as to an friend who just said or did something reasonably stupid) to a scathing remark on the inane actions of a worthy idiot.<br /><br /><br />smooth move exlax definition by Urban Dictionary
