laugh pimp
An individual who requires laughter in response to inane comments, stories and humor.  Typically, an employer/supervisor who derives adulation from an employee, who assumes the role of the 'laugh whore' and laughs at virtually everything the laugh pimp says. 
"Carl is such a laugh pimp.  He keeps making those dumb comments to try to get a laugh.  Too bad his laugh whore is the only one forcing a laugh." 