There are four essential items in any mans life: pound the pussy, eat some
food, good shit, and a nice nap. Pound.
Eat. Shit. Nap.
The big four is when you can hit all those items in a single
day. But it only counts when you hit all four. You can't count two eats, one shit, and one nap, as a big four. However, once the four are completed in a single
day, you can add on additional items for a Big Five, Big Six, and so on.