John Cena

What else could it be ?

If memory serves me right, they actually broke off the top of a wooden broom for the prop.

EDIT: Yep: "I think it was part of a broomstick," Schumer said. "Jimmy was our prop guy and he was whittling one day. I was like, 'What you doing, Jimmy? What you working on?' He was like, 'I'm making John's erection.'"
 
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