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He draws everything in sweeping, simplistic curves. Draw the bottom part of a tit and that's just how tits are, draw the top part like that and you have two options; you either have a weird balloon shaped tit, or the banana tits you speak of.
Next thing you'll be asking why all the Butch Hartman characters have triangle tits or a straight up half-circle shape... Because that nigga likes simple shapes and thick lines that are easy to keep on model and cheap to animate.