Shush it

Yep, shush it.
Yesterday we set out to run some errands. Logan picked out pumpkins for him and Bean, as well as a 'family' one. Logan then picked out his costume at the local store. I'm interested in seeing if he will still want to wear it for trick or treating. As we were heading out of the store Logan begged for a balloon. Well, there was a huge line that we didn't want to deal with and we had already paid for his costume, so we told him maybe another time. We get loaded in the car and he continues to beg for a balloon. He wasn't liking our answers, so he told Jeremy to shush it. We weren't quite sure what we heard, so we let it go.
We get home, unload the car and after awhile Logan is getting ready for his nap. He didn't want to head up for a nap and was arguing with Jeremy about it, when all of a sudden Logan yells "Shush it!" Yeah that was loud and clear this time,and didn't go so well. First time we'v ever had to deal with that. And he knew how to use it in the right way! We never tell anyone to shush it, so we're not so clear as to where he heard it, but holy buckets. He felt bad after we explained that it's not nice to say that. So far we haven't heard it again....but he's only 2 1/2.