Actually, it is quite possible that the answer to the question what does FEIN mean will vary per the location and the situation in which the word is employed. As slang, it normally denotes an individual who is so fond of something that it becomes like an obsession for him/her, but But, it might portray someone having strong desires or being deeply interested. The FEIN definition slang online is most of the time amplified for comedy, mainly in the form of memes and videos. One has to rely on context here because some people may use the term in a funny way while for others it is more like a serious one. Grasping the conversation allows one to discern whether "fein" is merely playful internet slang or something rather profuse.
