Top Definition
A saying normally said after performing acts that emphasizes how great the act was, used after acts such as

1. Perfoming a dunkface upon someone

2. Doing an act that you are proud of or you find impressive

3. Saying a funny insult and you want to rub it in

4. You are feeling happy and want to yell to everyone and display how cool and happy you are

Prounounced: Goo-chi Fin-Ah Dow-unk
Chris: Now way i just got a 65 on the math final, what i thought i wasn't gonna pass that at all

Sarah:No way you did better than me i got a 45 on that

Chris: Gucci Finna Dunk!!

Sarah: Aint dis a bitch
by T0ph3r8 August 20, 2010

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