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1.
: A hater. Someone that talks negative about something you do or have done.
Hey Jim, Erica said your party was boring last night. Jim says "Erica is just A FAN" while Jim smiles with a wink ;)
by freestyle19722 October 27, 2011
 
2.
to like or dislike something.

comes from the facebook fan pages, where someone can become a fan of something (for example: John Smith became a fan of Turning the Pillow Over when it Gets Too Warm.)
"my friend bought the new xbox."
"i'm a fan."

"ellen? she's cool, i like what she says to the contestans on idol."
"i'm not a fan of ellen; she can get annoying."
by dvora levite March 15, 2010