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A sexual act. To perform the Iowa Chocolate Express, one must eat a heavy amount of corn (canned or fresh is fine) the night before. One must then, on a partner who is preferably lying prone, squat over their head and proceed to defecate while also walking down the partners back. The pieces of shit will look like train cars holding a shipment of corn! (Optional: while shitting, make train noises such as Chooga-chooga Choo-choo, etc.)
You: I ate way too much damn corn last night.

Friend: You know what that means right? Hire some hookers and...

In Unison: Iowa Chocolate Express Time!
by dndn95 December 01, 2009
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