Etymology
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goofball (n.)

"narcotic drug," 1938, slang, from goof + ball (n.1). As an intensive of goof (n.), it dates from 1959.

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Definitions of goofball

goofball (n.)
a man who is a stupid incompetent fool;
Synonyms: fathead / goof / bozo / jackass / goose / cuckoo / twat / zany
goofball (n.)
a person who amuses others by ridiculous behavior;
Synonyms: clown / buffoon / goof / merry andrew
From wordnet.princeton.edu