look up any word, like the eiffel tower:
 
1.
a man who masturbates excessively, usually to the exclusion of all other activities
That nutsmack, Dave, would rather stay home and jerk off than hang out with his friends.
by Katie February 18, 2003
 
2.
an act in which one release a huge load of jiz upon another
I just got nut smacked in the eye.
by bumble bee123 November 06, 2008