When a girl's sucking your dick and you pet her hair like you would pet a dog. Not to be confused with doggy style.
It's too bad that when that hooker does it dog style her bite is worse than her bark.
Dog Style is the same as "Doggystyle", however, it is a more appropriate term because "Doggy" is somewhat of a misnomer. Children call dogs "doggy", but adults (who have the actual sex) would refer to dogs as "dogs."
Woman: Phew! That was a real reaming!
Man: Yeah! Should we try to go right from reverse cow girl into dog style?
Woman: Boo yeah! I'll get on all fours!
Man: I'll enter from behind. I love dog style.