Phrase used to express disagreement or displeasement with a statement made by another person. It is used normally within discussions about video games on forums and imageboards.
The phrase originates from the relationship system that forms part of Bioware's title, Dragon Age: Origins, where the aforementioned Morrigan is found as an ally and playable character. This character is known for being quite good-looking, for her ability to shapeshift and for her bizarre opinions on pretty much everything, causing almost every attempt to start a conversation with she getting mad at you and the game displaying "Morrigan Dissaproves"
(general thread about first person shooters)
User 1: i think halo is teh best game evar!!!!1
User 2: Morrigan Disapproves
Morrigan: My mother and I spent good days killing the city wards.
Player: But is your mother a witch?
Morrigan: Oh, don't call her a witch, that is a very ugly word *morrigan disapproves*
She been though a lot and she the most beautiful and perfect girl u can ever ask for she cares for the people she loves and she awesome in the bed. She would do anything to see u and be with u and she cares and loves her bf and would do anything for so if u get a morrigan keep her
A total hot-head that you don't want to get angry. If you manage to become friends with her, though, she becomes a very funny, smart woman who will protect her friends in dire needs. She isn't the most beautiful girl, but she is very rare and hard to find.