flea's eyebrows en · NOUN
Meanings
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(plural, plural-only) Synonym of cat's whiskers.
Glutamine is the flea's eyebrows for quick recovery from workouts. Add 5 mg along with 5 mg creatine to your post-workout beverage and blend in a banana for the healing properties of potassium.
2008, Jason S. Comely, Zero to Superhero, page 42: