Parker:「ベロが出てるよ。」

 = Bero ga deteru yo.

= Your tongue is sticking out.

Phineas:「いいの、ほっといて」

= Iino, hottoite.

= Just leave me alone!

Parker: ベー

= Beeh

Phineas:「自分だって舌、出してるじゃん。」

= Jibun datte shita, dashiteru jan.

= You should talk. You are sticking out your tongue, too.