To have too much caffeine in your system to a point where you can no longer have proper train of thought.

A term usually used to insult someone. This person should be fat, stupid, gay, retarded, weird, lazy, and/or awkward to be with. Also could be used to describe someone who is not there for things.

Caffin is used to describe someone (usually in anime) who are dumb. Most of these anime caffins die.

Hyper, At full speed

A Caffin, or Caffinpop, is commonly referred as someone who is a little bit out of the ordinary. A Caffin does things just for teh lulz. Caffins are known to go across the nation just to prove a point or surprise someone. Caffins are usually fat otaku who fall asleep while watching anime

the holy process of awakening of body cells after consuming caffeine

Drinking a caffinated beverage early in the morning to kickstart your crappy day