(Verb.) During an instant messaging session were after a long, usually awkward pause, one of the two people participating in the chat begins to type but quickly takes it back, leaving the other person to wonder what they were going to say. Usually the person doesn't question what they were going to say.
6:12 - Guy #1: So yeah.
6:12 - Guy #2: yup..
6:15 - Guy #2: (begins to type.)
6:15 - Guy #2: (Deletes what he had)
Term referred to when people wear their pants down past their butt hole. This term originates from when cell mates in prison would wear their pants past their butt holes and would bend down to take it "in and out".