Meaning of petticoat tail in English:

petticoat tail

Pronunciation /ˈpɛtɪkəʊt ˌteɪl/

noun

Scottish
  • A triangular piece of shortcake or shortbread biscuit, cut out of a round and scalloped at the outer edge. Usually in plural.

Origin

Early 19th century; earliest use found in Walter Scott (1771–1832), poet and novelist. From petticoat + tail, apparently so called on account of the resemblance in appearance.