Derogatory term for diminutive small or tatty spare motorcycle used to stand in for a proper machine.
Common to owners of vintage British motorcycles. Assumed 'Crunch' refers to accident or broken down status.
Honda stepthru C50/C90 or 'granny basher' is a typical. 'Crunch.'
'Hey, what's with the plastic crap?'
'Yeah, its my crunch, the old nail's in bits'