A BBQ/Party where you invite all your friends, their friends, their kids, pets and strangers to consume and indulge in all your food and alcohol, produce T-Shirts and other giveaways, and party so hard your jealous neighbors phone the fuzz.
BBQ: Outside lunch/dinner party usually involving food prepared on a grill
Mitzvah: Good Deed
Kirk's BBQMitzvah is the best. My all time favorite was his fifth annual when the theme was "Make Love, Not Jihad".