Group slick legging, where each man is positioned on top of the other like a stack of buttery pancakes (except they are mancakes).
A slick stack of 5 or more can also be referred to as a slick tower.
Back in my day, slick legging was between an inmate and his cellmate. Kids these days do not have any respect for traditional slick legging, now they won't do anything other than slick stacking. What's next? Slick squirreling?
When you are on bottom of sixty nine, while your girl is sucking you off, you wrap your legs around her neck forcing her to gag on your beef while you fart and make her choke on your meat and your stink.