It is when someone uses the excuse "God did it" (a.k.a Godidit) as an explanation for something which they can't explain.
Christian: Uh...well...don't question the mighty power! God did it!
Atheist: *sigh*, Not more Godiditional forms used as an argument! Ack!
Atheist: Who stole my pen? Was it you Brady?
Brady (the Christian): No, I didn't do it? Godidit
Atheist: *sigh*, it's the second Godiditional form I've seen in the last 5 minutes!