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A fink is a wimp who ratted you out just because they felt like it. They’re the reason you got in trouble for something you didn’t even do.
My buddy got sent to the principal’s office because a fink told on him for eating a muffin during math.
That fink snitched on me just because I beat him at a video game.
I got grounded because my little brother was a fink and told on me for eating pizza for breakfast.