An intertouchdown occurs when a defender intercepts a pass in his endzone and instead of having the interception ruled a touchback, a replacement NFL referee calls that interception a touchdown for the other team.

To signal an intertouchdown, a replacement ref pulls down his pants and shoves his head up into his anal cavity via his anus.
Fred: "Did you see that MNF game last night? Wow, the Packers were robbed by the replacement refs. I think the Seahawks QB became the first player in NFL history to throw a game winning interception!"

Marty: "Yeah. Nice intertouchdown for the win there Seahawks."

Fred: "Intertouchdown? What's the signal for an intertouchdown?"

Marty: "To signal an intertouchdown, a replacement ref pulls down his pants and shoves his head up his ass."
by m_piet September 25, 2012
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