Plumb loco American adjective slang
Completely crazy or insane
After his daughter's dealth, he went plumb loco.
Your decision is really plumb loco.
You must be plumb loco to go out in such awful weather
Stupid or crazy
If you're off your trolley, your ideas or behaviour are crazy or insane.
Suddenly become crazy or very angry or lose control
Totally insane; overflowing with emotion, especially rage or enthusiasm
The word "loco" originating from a Spanish word means "mad".
People tend to like forbidden or illegal things just because they are forbidden or illegal.
He must have believed that stolen fruit is the sweetest, and he, therefore, cheated on his partner.