gone to plaid

When something moves entirely too fast (reference from Spaceballs) especially in the case of a relationship.

Joe - Hey did you hear Ken and Sue are engaged already?
Mike - But they just met last week!
Joe - I know, they've totally gone to plaid.

gone plaid

Reached a state of babbling incoherence, rambling random, absurd gibberish. Origin: Spaceballs

By that point, he had long since gone plaid, and had no idea what he was trying to say.