Sentence:  What may bar "EastEnders" from acceptance in the U.S. is not immorality but unintelligibility. PBS may even distribute a glossary of Cockney phrases so that Americans will know what a character means when he or she is "over the moon," "skint," "<WSD>pipped to the post</WSD>," or "in the club" (happy, broke, defeated, or pregnant). 
Meaning of the word marked with <WSD> tags:  to overcome a prominent competitor, gaining his position, especially by making a smart sudden move.