having sex with more than one person in a public place, often with at least one stranger, and usually with others watching. (Hence a more or less spontaneous meeting point between "exhibitionists" and "voyeurs".) Good for spreading the DNA around. The word comes from the idea of dogs "doing it" in the open air with whoever else they happen to bump into. Also includes the sense of dogs wandering around in groups in search of something interesting to sniff ....
A: Where's the best place for doggin' in England then?
B: I dunno
A: It's go'a be in the fackin' park in Maidstone, enni'?