Do you understand your toddler's speech better than your significant other?

Pretty much if I don't know, neither does my wife. He signs and we both know all the signs he knows, but when he uses just his words we are at a completely loss. So far there has only been a couple times neither of us could make sense of what he was saying. "Yyayya" means "outside" Who would have ever guessed that. Then "Deff awooo" means "Jeff's at work." That took my teens figuring out... I can't think of another example.