A fucked up combination of lunch and supper; caused when young lovers screw from the early hours of the morning to till the afternoon, and bodily needs (such as hunger) forces them to drag their sorry, teenage screwing asses out of bed to go to Denny's and fulfill their post sex needs. Then after filling their stomachs, the ignorant, idiotic teengers go back at it until they awaken again for brunch. The usual hours for lupper are from whenever the hell you start fuckin to 3 P.M.
Girl: OHHH BABYY OOHHHH.....
Guy: yea yea get it oh wait im kinda hungry
Girl: lets go get sum lupper at dennys!