yellow dog

Short definition from Wiktionary

Noun

1. 1
   Used other than figuratively or idiomatically: see yellow, dog.
2. 2
   A Carolina dog.
3. 3
   An item or person of low value.
4. 4
   Ellipsis of Yellow Dog Democrat.
5. 5
   Alternative form of yellow dog.
6. 6
   Alternative letter-case form of yellow dog, chiefly used when the word has the sense "Carolina dog" or the sense "Yellow Dog Democrat".