When you and your best friend both hook up with a girl (the same girl) at the same time. Said girl should be too drunk to realize that they are making out with more than one person, adding to the enjoyment.
Cory and Trevor totally langdoned that drunk girl on the pier last night. She was all over Cory, but when Trevor stepped in she couldn't even tell the difference!
Langdon is an ancient Anglo-Saxon name meaning "one who inflicts pestilence, one who heals", and was given to a small woman with a tongue as sharp as a double edged-sword. It was believed she could inflict deadly pestilence on the enemy nations, while had the ability to cure disease. A Langdon was generally stubborn, pissy, and occasionally happy.
"stop acting like such a Langdon!"
"the black plague began with langdon"