Sideways Land
It's when when a show has reached the point of being totally unbelievable as in the final season of Lost.
When the A Team built a cabbage thrower to help protect the abused migrant workers from the bad union guys the show went to Sideways Land.
Also related to "Nuke the fridge" and "Jump the shark tank"
Also related to "Nuke the fridge" and "Jump the shark tank"