Even the skinniest dog has fleas

A "neodiom", if you will. This means that a person with any notoriety or social status will always have people trying to leech off of their success, no matter how relatively unimpressive they are. Coined by Paul'sEgo of the Deep Fat Fried podcast.

TJ: What's more pathetic is you two losers riding the dismal, tiny-ass coattails of that fucking nitwit.
Paul: Even the skinniest dog has fleas, TJ.