A bladder blocker is one of those ner do well friends and associates who seem to think that it's welcome and approrprate to intercept you need to urinate and they stop you outside the bathroom door at the worst possible moment.
Related to: Dump Blocker
What's with that butthead, everytime I have the urge he has to bladder block me!
Freaking Bladder Blocker! Next time I'm just going to smile and pee on his foot how's that for warm and fuzzy!