After masturbation, to hide the sight of a raging erection, the penis is lifted and the elastic of the shorts/pants is used to tuck in said penis. A lift and tucker should avoid walking around without a shirt though since the top of the penis is sometimes visible.
Lloyd: Sup homes?
Al: What the hell Lloyd *points to elastic of Lloyd's pants*
Lloyd: ....woah! uhh
Al: Holy lift and tuck!