Car Park Ticket Forging... On motorbikes

Woke up thinking it was a movie I'd seen at some point. About a failed fat musician (fat Elvis) who has discovered that a species of grass can copy any pattern from whatever was placed on top of it (like a photocopier). So he goes about forging car park tickets so he can then get refunds for them from ticket machines (25p at a time)...This is done through the movie on motorbikes (akin to 'on ice' type events)..... And when I woke this morning I spent an embarrassing amount of time trying to remember the movie name.....

Fat Elvis on his motorbike, scooting off to fraudulently cash in fake Car Parking tickets.