An assortment of cogs, wires and nails. This is used to describe a mess of un-needed parts and such that will get in the way.
Gerald the Builder: *Spill bucket of nails*
Craig Blacklock the Builder: Damn Gerald you just made a Cognoffin!
Gerald the Builder: A what?
Craig Blacklock the Builder: A mess of un-needed parts and such that will get in the way.