goofball

A foolish or silly person or animal.

If that goofball would put half the effort into her studies as she does into her juggling, she might do very well.

A pill or tablet containing a pharmaceutical which has hypnotic or intoxicating effects, especially a barbiturate.

Strong Cobb & Co. of Cleveland announced a new barbiturate which in overlarge doses will turn the stomachs of "goofball" addicts and would-be suicides.

That night Marylou took everything in the books; she took tea, goofballs, benny, liquor, and even asked Old Bull for a shot of M, which of course he didn’t give her; he did give her a martini.

Silly.

He announced, with his usual goofball humor, that he'd like to marry me!