Thought this was hilarious so had to share.
We were feeding the kids dinner but X wouldnt eat his. The bf and I started getting really cross with him so we put on our angry faces and told him sternly to eat his dinner. Cheeky little shit turns around with the biggest cheesy grin on his face and decides to tell us his new word.
With a big toothy grin he shouts at the top of his lungs, 'BUM!'