We found 4 dictionaries that define the word mutt's nuts:

General (2 matching dictionaries)

1. Mutt's nuts, The mutt's nuts: Phrase Finder
2. mutt's nuts: Wiktionary

Slang (2 matching dictionaries)

3. mutt's nuts: English slang and colloquialisms used in the United Kingdom
4. Mutt's nuts, mutts nuts, the mutt's nuts: Urban Dictionary

Definitions from Wiktionary (mutt's nuts) ▸ noun:  (British, vulgar slang) Something regarded as outstandingly good. ▸ Words similar to mutt's nuts ▸ Usage examples for mutt's nuts ▸ Idioms related to mutt's nuts ▸ Wikipedia articles (New!) ▸ Words that often appear near mutt's nuts ▸ Rhymes of mutt's nuts ▸ Invented words related to mutt's nuts