1.nounA meal, especially one offered to a guest, consisting of whatever food is available.
"Here are some leftover beans and meat; we can make a good potluck stew from them."
2.noun(by extension) Whatever is available in a particular situation.
3.noun(originally Canada) A shared meal consisting of whatever guests have brought (sometimes without prior arrangement); a potlatch; also, a dish of food brought to such a meal.
4.nounThe last draft or portion of an alcoholic beverage in a pot or other drinking vessel.