aisle blockers
Aisle blockers are usually two heavy set women who stop to chat,side by side, in the middle of the aisle in grocery stores or discount stores. The combination of their big wide butts plus their shopping carts makes the entire aisle virtually impassable in either direction because they are too fuckin' rude to move to the side.
I had to take a two aisle detour just to get a box of CoCo Puffs because of two cows acting as aisle blockers.