plastic pig
Term for a Reliant Robin, small 3 wheeled car/van made from GRP in Tamworth. Made famous as the transport for del boy in the TV show only fools and horses. Very slow and has a tendency to roll over when cornering. Used as a term of abuse for any slow or crap car. See also metrocab.
Example:
Bloke: "Why were you so late?"
Another bloke: "Coz i was stuck behind a plastic pig all the way up the M42
Bloke: "Why were you so late?"
Another bloke: "Coz i was stuck behind a plastic pig all the way up the M42