A group-sex act in which three males penetrate a female, with two penises in her vagina and one in her mouth. The female is also penetrated anally with a butt plug or dildo. The act ends with the three males ejaculating in the female's mouth ("lunch time"). There are subclassifications and variations, for example: "bento box" (Asian female), "A-Team lunchbox" (two penises in the anus and a dildo in the vagina), "no thermos" (butt plug or dildo not present), and "with baggies" (condoms present).
My girlfriend is into wild sex. Tonight she wants me and my buddies to lunchbox her. If she's feeling relaxed, she said said she might even try an "A-Team."