St. Nicolass Share definition Flag A girl whose ass is so nice, when she shows you it, she puts you in a good mood till christmas. Santa's biggest helper. "You sure are in a good mood" "Ah ya, just saw St. Nicolass's butt" "Nice" St. Nicolass by Moneyshotman February 11, 2010 0 0 Get merch Get the St. Nicolass mug. Buy Now — $32.95 See more merch