The priest & the choir boy...

Johnny & Billy are playing in the school yard. Billy asks, Johnny, what's a *****. Johnny says he will ask his dad tonight....which he does at the dinner table. Dad gets cranky about such subjects during dinner & tells Johnny to come into the bedroom after dinner. Dad drops his pants & shows Johnny his *****.
Next day at school, Billy asks Johnny if he found out what a ***** is. Yeah, he said, come over here behind the tree & I will show you....
Johnny drops his pants. See that: that's a dick, a ***** is 2" shorter....