A Lou is a type of person who will do anything for some ass. This person can be a boy or girl, but is always a pig/whore. A Lou might text people asking for quickies, but rewording it by saying "15 minutes?". Beware of Lou's. Once they are in, its hard to get them out.
Wow, that guy is totally pulling a Lou. He's sleeping with 6 of my friends and is still trying to get with me?