When a slower vehicle overtakes a faster vehicle after a speed contest. After the speed contest has finished, the slower vehicle proceeds to pass the faster vehicle to inflate the ego /recieve an erection/brag to friends, or any combination of the above. This loser flyby can be performed by any make/model of vehicle, as long as the said car is significantly slower than the opponent. See also ricer flyby, meathead flyby.
Billy-boy: Did you see that joe-bob, I just smoked that riceboy civic there?
Joe-bob: No you did'nt, you just performed a loser flyby.

or
Riceboy: Bro I just dusted that Mustang...
Riceboy's friend: Dude...that was a total loser flyby.
door 572 23 oktober 2007

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