An exclamation state when something or somebody is smelling but you don't want to offend the person
Girl!! You're boom knack woah
#me entering my room... Boom knack woah!!
Hey dude, do you want to come down my place for some tabber knacking?
Oh yeah! I can't wait to knack our tabbers together.
Jack ass, typically said to someone that is worth less than a tourist trap item
Did you see quintin harassing that girl, yeah hes a real Knick Knack
Used as one of many ways of saying nigga without actually saying nigga. Commonly used by corny white folks who don't know any better.
white friend: yo what up my knick knack
black friend: goofy ass