Hi (The) Joker. Actually, very sure. The other words I've come up with from various Google searches are babbie, babbit, bebait, bobbie, and bobwig. Any good to you?!
Chambers gives a few variations of a word meaning a trifling or insignifant amount (diddly squat?) bubkes, bubkis, bupkes and bupkis. You have the public vehicle there, but I can't account for the k - unless it's bk for book