A fictional creature from the book Bogwoppit, published in 1978 by the author Ursula Moray Williams. The book "concerned the problems of taming the mysterious and mischievous bogwoppits that the young heroine discovers in the marsh."*
See:
*= from the Guardian obituraries
Also, for the author, see Wikipedia
A racist term used to describe the black people who populate restaurant/club/bar toilets and try to sell you aftershave/perfume whilst taking control of the sinks and making you feel as if you have to pay to wash your hands.
Bogwog: No splash, no gash!
Den: Nah mate, piss is sterile.
////Den walks out, wiping his piss-covered hands on his jeans.