Found in Brock Baker's parody of Rebecca Black's viral song, "Friday". It is used to describe the wavy motion of one of the kid's hands when they're driving in the car.
Person 1: *waves hand* "MY HAND IS A DOLPHIN!!!!11ONEONE"
by purplechik14 March 30, 2011
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A phrase made popular by the parody of Rebecca Black's Friday, Friday- Rebecca Black (Brock's Dub).
by Meizee April 5, 2011
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This syndrome has been made popular by Rebeecca Black's "Friday" song.

The syndrome has been relatively ignored until this point. This has been a condition that effects all ages and races. Some of the signs of My-hand-is-a-Dolphin Syndrome (a.k.a. MHISADS) is the need to roll down the window in the car when you are "kicking it" in the front-seat or in the back-seat with your friends, then sliding your arm out and moving your hand and forearm up and down in a fashion which appears like a dolphin riding a bow of a ship.
Ryan - "Yeah, i was taking Nick home and all of a sudden, he started moving his hand up and down out the window like a damn dolphin"

Kevin - "Wow! I guess he caught that My-hand-is-a-Dolphin Syndrome. That's crazy! Hope you don't get it"
by einsBAMF69 April 26, 2011
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