When someone is walking beside you and they don't observe a straight line, but rather move into you in (unintentional) repeated, subtle bumps, much like a sheepdog herding cattle, forcing you off your intended path.

The sheepdogger is the one pushing; the sheepdoggee is the one getting pushed.

The act of carrying a weapon with you while out with family, friends, or alone.

Borrowed from the example that most people are like sheep and are preyed upon by wolves (criminals), unless there is a sheep dog (armed person) present to protect them from the wolf.