1. (adjective)nuts crazy There were too many people - it was nuts.; You're nuts!
2. nuts nuts about very much in love with She's nuts about her new boyfriend.
3. nuts very enthusiastic about kids who are nuts about football
Definition of 'nuts'
U.S. National Library of Medicine
1. nuts Botanically, a type of single-seeded fruit in which the pericarpenclosing the seed is a hard woody shell. In commonusage the term is used loosely for any hard, oil-rich kernel. Of those commonly eaten, only hazel, filbert, and chestnut are strictly nuts. Walnuts, pecans, almonds, and coconuts are really drupes. Brazil nuts, pistachios, macadamias, and cashews are really seeds with a hard shell derived from the testa rather than the pericarp.
Definitions of nuts 
