I Have to go Potty Mommy

Yesterday while we were running errands Gabriel informs me he has to go poo poo. I told him to hold it until we can stop somewhere. He grabs his bottom. I explained to him that I meant to hold the poo poo in, not to hold his bottom. Anyway he then replies, "Yeah, if I don't then Spiderman will get dirty." (He had on Spiderman underware.)