thicky nikki refers to anyone named Nikki who definitely has them curves, and a really nice ass. most times, she's blonde, and isn't afraid to let the world know how curvy she really is.
A dime piece with them thick thighs, plump booty, 12/6 hammer tits and basically just THICK without being fat. It's with a sports reference aka rickey henderson, a name to categorize all those fine ass thicky babies in the world. Can be used with any rickey's or rick's or something similar.