This phrase of his is also my favorite thing he says. Whenever Luke says it and it is a lot he gets very excited or smiles and I get a smile on my face. Mom and I have speculated on what exactly he is trying to say and one idea we've had is that he is trying to say "I love you". That is wishful thinking but it would pretty awesome if he says I love you 20 times a day.
I'm guessing that as he gets older and he'll stop saying my favorite phrase and we'll never know what he was trying to say.