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.

gone plaid by Barbarossa1553 June 8, 2011

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 to plaid by conipto2 November 10, 2006