"bu-bye"

"Bu-bye" our son will say when it is time for us to remove the cold medicine from him, or to stop trying to feed him his evening snack or when someone has been staying at our home for too long or when it seems apparent that his dad is about to leave for work.
He also sometimes says "bu-bye" when it is time for bed. Once recently he turned off the tv at 9am, said "bu-bye" to everyone and everything and asked his mother to take him upstairs and to bed.
Almost always, after saying "bu-bye" he blows kisses to people. This includes when he says "bu-bye" to the construction workers working on our road outside our complex.