Cut the loin into 4 to 6 inch long chunks--depending on the size of the slow cooker. For the most part, longer chunks are better than shorter ones
Quarter a large onion. If using a big slow cooker and lots of pork, you might want to use 2 medium-sized onions
Put the meat and the onions into the slow cooker
Pour enough ginger ale into the slow cooker to cover the meat.
Drink any remaining ginger ale to remind yourself that you never really liked how it tasted
Put the slow cooker on high and let it go until the meat is falling-apart tender (poke it at 4 hours or so to check)
Have a nice tasty cold beverage while waiting for the slow cooker to do its thing
You may have to repeat step 8 if you are a fast drinker
When meat it done, dump ginger ale and onion quarters into the garbage disposal and grind them into little bits
With a fork, or your hands if you are tough, pull the pork apart into nice bite-sized chunks
Dump all the meat into a bowl and mix with your favorite BBQ sauce. Use as much or as little BBQ sauce as you see fit
If the BBQ will be sitting out for a while (like at a potluck), put it in the slow cooker at low temperature to keep it warm. Stir occasionally to keep the stuff on the edges from drying out
Provide hamburger buns or rolls or just plain ole bread because this stuff is great as a sandwich. Note though, it is equally nice to nibble on it with your fingers, or a fork, as well
Have extra BBQ sauce laying out. Some people like their sandwiches like their women -- really sloppy
Don't tell your friends how easy it is to make--let them think you worked hard on it all day