Pickle bob?

During the last few weeks, Riley's jabbering has really picked up. He has started to "talk" with more feeling and bigger gestures. He gets down right frustrated sometimes that no one seems to understand what he's trying to say. Last night, we were eating at Sweet Peppers Deli; he was enjoying a hot dog and fresh fruit cup when he started saying "pickle bob." Jeff and I looked at each other...and then him...and then just died laughing, which of course, just made him say it more and louder. 

So, if anyone knows what "pickle bob" might mean - we'd love to hear your interpretations!