Getting your belly button filled up with multiple jizz loads
During my gangbang everyone gave me a pillsbury showdown to see who could fill my belly button up first
Ordering two or more takeaways to a house for them to then battle it out for your money.
"We had a takeaway showdown last night. We ordered four takeaways, Domino's won, they delivered a PowerPoint presentation"
When multiple people say fuck you to each other.
Fuck you Dave, well fuck you Tom, we just had a fuck you showdown.