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."