Any elongated blunt instrument used to beat common sense into one's uninformed counterpart. At times, a schwackum stick can be a doppleganger for a golf club, baseball bat, tree limb, shillelagh, or sawed-off pool cue.
One day, while driving down the road one bright, country day we see a cow in the middle of the road. We honked, it didn't move. So we reached in the back for what we call our schwackum sticks and we schwacked that cow back to the field where it belonged.
Dave was going to go to the Mastodon show but he sold his tickets claiming the band was too mainstream, he' such a schwack. I think he's become a troll for the schwackism movement.
Comes from Halo 1. It is when you melee some one in the back of the head and kill them with one blow (schwack).
I was on Blood Gulch and came across a sniper he didn't know I was behind him so i gave him a schwack and took his sniper rifle then proceeded to go on a killing spree!