One-trick Pablo (noun):
A performer (often a standup comic) who, while funny at first, has become old, tiresome, and appears unable to come up with any new material.
One-trick Pablos generally have highly respected and well
recognized early performances published on YouTube, however they lack the
creativity to continue their development beyond this initial success.
One-trick Pablos are often still touring, flogging the same dated and boring shit, sometimes packaged slightly differently.
Origin:
Named after Pablo Francisco - who gained fame from his MadTV and Comedy Central Presents appearance in 2000 - who continues to tour, attract massive crowds to see hacked up versions of his original material interspersed with un-intelligible raves, baby talk and sex humor which leaves most of the fans
disappointed (except for the retards).