Meaning of buttstrap

butt•strap

Pronunciation: (but'strap"), [key]
— n., v., -strapped, -strap•ping.
—n.
  1. (in metal construction) a plate which overlaps and fastens two pieces butted together.
—v.t.
  1. to unite with a buttstrap or buttstraps.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.