We found one dictionary that defines the word thin as a barber's cat:

General (1 matching dictionary)

1. thin as a barber's cat: Wiktionary

Definitions from Wiktionary (thin as a barber's cat) ▸ adjective:  (simile) Very thin. ▸ Words similar to thin as a barber's cat ▸ Usage examples for thin as a barber's cat ▸ Idioms related to thin as a barber's cat ▸ Wikipedia articles (New!) ▸ Popular nouns described by thin as a barber's cat ▸ Words that often appear near thin as a barber's cat ▸ Rhymes of thin as a barber's cat ▸ Invented words related to thin as a barber's cat