look up any word, like smh:
 
1.
I Really Don't Like That
I Fucking Hate That
No Me Gusta That
I Seriously Do Not Enjoy That
When Everyone Leaves And I'm The Only Register Open I Am Not A Fan.

Mullets: I Am Not A Fan!

by Tatume05 June 17, 2003
 
2.
Referring to the popular trend on Facebook of becoming a fan of something...except that you wouldn't become a fan.
Example 1:

Man walks past in purple short shorts and hairy legs.
Jenn: "I am not a fan of hairy men and short shorts"

Example 2:
Sarah after reading article about Ann Coulter: "I am not a fan of that woman."
by danton2015 April 08, 2010