Prepare coleslaw and place in the fridge for later.
Heat a large skillet over medium-low heat. Add leftover smoked chuck roast and barbecue sauce to the skillet and stir to combine. Cover and let beef heat up until nice and hot.
Slice Hawaiian rolls in half and place in the toaster oven to lightly toast.
Assemble sliders by spreading mayonnaise on rolls, then top with warm smoked beef, coleslaw and sliced pickles. For extra spice, drizzle with a little sriracha or tabasco hot sauce.