similar to fuck it, but without the swearing required. used to describe something you don't want to do, or something bad that has happened. origin; New Zealand Navy
Pers 1 "hey dude, want to come for a feed tomorrow?"
Pers 2 "um yeah, let mething about it. Smack It"
Pers 1 "hey the boss wants to see you"
Pers 2 "argh, Smack It!"