Ga-gah please

Willson has a new word. Ga-gah. I have no idea what he's talking about, but he's been saying it to me for 2 days now with increasing frustration. Sometimes it's even whimpered. I have walked around the house, with him, trying to locate ga-gah, but to no avail. At first I thought it was cracker, but that is gaa-ga and that made him really angry when I assumed that was what he was saying. Apparently ga-gah is more important then a mere gaa-ga. I was on the phone with my mom, telling her about it and the kids started crowing ga-gah ga-gah. Yeah Willson wasn't impressed or pleased. If anyone out there knows what ga-gah is PLEASE let me know. Until then the search for the elusive ga-gah continues.