Combination of the words "food" and "acne." Describes the food stains on somebody's face after eating something messy, giving a zit-like appearance on their chin. Usually, the person has no idea.
On Facebook: Condition when one has to sift through multiple status updates from ONE annoying facebook friend that one has to sift through with a fine tooth comb just to be able to read other poeples' status updates.
Sorry Andrea I didn't see your update, i got "Facne". Jim is updating his facebook status every 2.5 mins with song lyrics while he works.