LOL! What a dork. (In a good way, too.) I would have laughed, too. :)
"Whaffo dokkie baks?" I couldn't figure out what he was asking and asked him to repeat which he did:
"Whaffo dokkie baks?"
Again I couldn't figure out the question until he repeated it a third time when it dawned on me he was asking me what the doggie bags they gave them were for. I thought quickly and replied with a hint of Japanese accent:
"Ah so! Ancient American custom. They give you dokkie baks and then you give to first American you see."
They all politely honored this "ancient American custom" and handed me all their doggie bags. I immediately went home and had me an incredible dinner with enough left over for the next day. Oh, and I made sure to politely bow to them when they handed over the "dokkie baks."