Phonograms

Does anyone know what phonograms are?

Because apparently I really suck at them. Every day Big Kid comes home all charged up about phonograms and I have a very limited idea of what he's trying to convey (something with phonics and hand gestures). Then he asks me to repeat after him and I screw it all up and he's pissed and we all end up frustrated.

I swear I'm doing a reasonable imitation of what he's doing, but he swears not. Just wondering if we have any kindy teachers in the closet who could educate me.

Maybe it's Phonigrams? I don't even know.