Smooth, as cool as the other side of the pillow, the
shit or simply something that is top
notch or untouchable.
Could be used by saying "Stay Durden" for signing an
email or instead of ending a phone call with "bye." It means to stay
chill or cool. It could also be used in saying that
shit is "Tyler Durden" which means that you can't get any cooler than that.