bookie's pencil
a rather small penis. this refers to the small stub of pencil normally found in a betting shop or bookmakers, the shortened version of which is known as a bookie.
he's got a cock like a bookie's pencil.
Bookies pencil
Short penis with no girth whatsoever
I caught a glimpse of Dave's cock in the changing room at work ..... fuckin thing looks like a bookies pencil. I've seen more girth on a maccy d's straw. When he fucks his missus it must be like throwing a chip up dartford tunnel.