When a couple trys to create the illusion that they arent together and sneak off to hook up and/or cuddle with each other with no one around.
Also when a couple will say they feel tired or arent around to their friends when asked to hang out but really are just at home being anti-social babies. Usually playing with cats or other herb-ish things.
Usually at the party matt and lindsey perform cuddlingis inside.
Those two have been acting very shady and keep going in front, they must be in the act of cuddlingis.
Charlie Sheen goes to hotels to perform cuddlingis, but usually it ends up with a hooker or two