Hahaha this is my all time fav phrase. Yes it seems childish, but only when you use it constantly, if you wait for really good one it always gets me and my friends cracking up. For example we were at the park one day and I bought a hotdog for my bro and he said he didnt want it so this is how it went:
Bro: "I don't want it"
Me: "Just eat it, you havn't eatin all day"
Bro: "I don't like it"
Me: "Fine, wrap it up and give it to me"
Friend: "That's what she said!!!"
Man it was hilarious, always gotta love those moments.