People have been Walking the dog in the streets of Montreal long before this...

Walking the dog

Code word for masturbating when you don't want people around you to know what you are really talking about. i.e. parents and children

Bob: So, now that you and Cindy broke up, you have to start walking -the-dog huh? Gary: Yeah... but ya' know .. I'll find a new girl soon. Thier Mom: Boys....you shouldn't expect women to walk-your-dogs, that is something you should do yourself. I walk-the-dog twice a day. It is good for everyone

Gary: Yeah? Well look at that... good to know mom.. I'll start walking the dog as much as possible..