When you place your wang between the butt-cheeks of your bedmate. Sometimes an innocent byproduct of spooning, sometimes a not-so-subtle hint that you're in the mood, occasionally purely for a laugh.
When Sally and I woke up this morning we realized at the sametime that I had bookmarked her.
What a potential date does when they want to keep you available, but don't want to commit to a specific date. They mayask your availability, but not commit to a date per se. You are on the back burner, so to speak.
When a friend leaves you with a person they just met in order to pursue another person they find more attractive. You are suppossed to keep that person occupied in case they stike out with the second.
"Dave had me bookmarking with Julie while he went to talk to Linda."