They are just trousers that are a bit loose so that they slouch in the legs and sit a bit lower on the waist. There are different degrees of slouch - the BF jeans that everyone is wearing are super slouchy, especially when sized up. Angie's out fit here features slightly slouch trousers.
http://youlookfab.com/2012/07/.....user-look/
Trousers can either be intended to be slouchy, or you can size up to achieve the slouch.