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.
"check out thicky henderson over there with that badunkadunk"