Used to refer to an eccentric person or idea. A reference to the song "MacArthur Park," one of oddest songs ever written.
John: My next door neighbor thinks little green men control the government through mind control.

Paul: Someone left the cake out in the rain.
by devil doll October 20, 2009
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Use to refer to a person with swamp ass or a visible wet spot on their ass (cake). Based on the song Used to refer to an eccentric person or idea. A reference to the song "MacArthur Park” by Donna Summer.
Greg: sees a person with swamp ass Someone left the cake out in the rain.
by Dogenero September 22, 2022
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