Katy bar the door 'Katy (or Katie) bar the door' means take precautions; there's trouble ahead. Fuvd euy vgk caay 2 u 1 e 0 1 c 1 k 0 0 1 g 0 0 1 f 0 0 0 2 a 0 0 2 y 0 2 v 0 0 0 0 1 d 0