WordWeb Online

1. Someone who is a stupid incompetent fool
   - fathead [informal], goof [informal], goofball [N. Amer, informal], bozo [N. Amer, informal], goose [informal], cuckoo, zany
    
2. Male donkey
   - jack

Derived forms: jackasses

Type of: ass, boofhead [Austral, informal], charlie [Brit, informal], diddy [Brit, informal], dill [Austral, NZ, informal], drongo [Austral, NZ, informal], fool, galah [Austral, informal], juggins [Brit, informal], jughead [N. Amer, informal], mampara [S.Africa, informal], meathead [informal], moegoe [S.Africa, informal], muggins [Brit, informal], nit [Brit, informal], sap [N. Amer, informal], tomfool

Encyclopedia: Jackass