Similar Words to Jackass:

Bozo
Cuckoo
Fathead
Goof
Goofball
Goose
Jack
Twat
Zany

Examples:

1. That jackass Caxton and her old lady screwing up the team.
2. That jackass Walsh not only wrecked his vessel, but in saving-- That's one jackass we're going to see skinned.
3. . . .and your lovesick jackass of a brother

Definitions of Jackass:

1. A man who is a stupid incompetent fool
2. Male donkey