Waving after eating?

I'm completely new to owning reptiles, and obviously Bearded Dragons. This might be nothing but im just curious, my Bearded Dragon is about four months old, i got him from the pet store only about a week ago. His (or her) name is Toby. I know that when they wave its a sign of submission to a bigger bearded or a bigger animal, or a greeting to a fellow bearded. But he only waves after I feed him and i was just wondering if anyone knows what that may mean? Or if anyone elses beardie does this. Im not concerned im just curious

They wave for all the reasons you mentioned. They also randomly wave. it's probably more coincidental then related to the feedings.

I thought as much, he may be waving at his reflection.

Toothless did that to me when little but big enough to have a bit of floor exploration time.... (wasn't waving at his own reflection , Peppa did that though and til she figured out that the ghost beardie was not really there) , I waved back beardie style to him and got some classic looks from him and usually stopped him in his tracks for a while (guess he was trying figure exactly what I was saying to him and I probably "mispronounced" what I was saying to him.

They are full of personality and soon work out how to get their pet / slave (human) to do their bidding .... not just dumb lizards .... lol.

In fact all my pet lizards "talk" to me, skinks (wild and pets0 do head flicks , tail wriggles and waves , front foot stamps, head cocks etc ) and dragons (armwaves, headflicks, headnods, colouring up brightly (sure sign beardie's happy !!) ...