A notluck is a
gathering where food will be eaten, but unlike a potluck,
the food you bring is just for yourself (meaning you can opt not to bring food if
you're not hungry).
"We had a potluck for the last movie night and Shannon was
the only one who brought food. So this time, it's a notluck: you're all on your own for dinner. And it's still BYOB, you drunks;
the company is not
springing for your beer."