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one who subscribes to the unconventional on a daily basis; one who's behavior is always a mystery, as well as, a delight to the beholder.
When Socks slept on the boxes of crackers he was a true goonatic. Not he only thing that was crackers!
by the old bear February 03, 2010
a stupid person or a goon and a lunitic
you are one goonatic you stupid fool!
by somebody you dont know May 02, 2008
A stupid person, a mixture of a goon and a lunatic
"oh my god you goonatic!"

"he can be such a goonatic!"
by Scott lockhart January 16, 2008