Pessoll
A man of seemingly no common sense. He will spill the beans on your most intimate secrets the first oppurtunity he gets and proceed to moan uncontrollably should you confront him on this.
Person A: Dave Just told the whole class about that night with the horse!
Person B: I tried to warn you! He's such a Pessoll
Person B: I tried to warn you! He's such a Pessoll