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Fish Arm.

pronounced: fish ahrm}

Noun

The upper limb of the human body, especially the part extending from the shoulder to the wrist, used in a fully extended fashion while your fishing partner takes a photo of your recent catch. Emphasis is placed on providing a perspective of the catch to give the illusion of overstating its overall size.

NOT to be confused with its antonym "alligator arms" (the behavior displayed by some when the check comes at the bar after said fishing trip).
Nice fish arms in that photo Bob. That 10", 1/2lb fish looks like a monster.
by toyworx June 08, 2018
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