LOL! Yeah, garter snakes are quite 'smelly' when they want to be left alone.
Per one website: Garter snakes have musk glands that produce a pungent, foul smelling substance. A garter snake will release the contents of its musk glands as well as the contents of its cloaca (a common chamber that contains wastes from the digestive tract, excretions from the kidneys and reproductive products) and smear this pungent mixture on themselves and their attackers. As if this is not enough to discourage the predator, garter snakes can also regurgitate the contents of its stomach onto itself and its attacker. Quite an interesting array of deterrents!
Still, all in all, I do love my resident snakes.