Drug dealer slang for an ignorant customer. They are uneducated on quality, what the correct amount should look like, prices, etc., and are easily tricked into agreeing to whatever the dealer tells them. A goofy that keeps coming back for more is a dealer's wet dream.
"Bruh that last guy I sold to was a straight up goofy, dude just spent $40 on half a G of mids!"
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