Actually, I visited the Moocows practice during the QB battle this is how the conversation between Grape and Hand Clapper went:
Smack Brown: My God, what is that smell? Oh.
Gilbert Grape: That's the smell of my desire to complete a pass.
Smack Brown: God no, it smells like, like a used diaper... filled with... Indian food. Oh, excuse me.
Gilbert Grape: You know, desire to complete passes smells like that to some people.