The Lannister

verb.

1. To abandon your current fwb, to run back home and fuck your sister

- Yeah Brienne was kinda gnarly, so I gave her the ol' Lannister and ran home to Cersei

- Keira was kinda gross after the Barn party. So when thing's got all hot and heavy, I gave her the ol' Lanny and ran back home to my beautiful sis!

- The Lannister is the act of leaving behind your fwb, to run home like a bitch to your nasty ass incesty sister