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1.
the absolute need for caffeine intake. normally occurs in the morning before anything deemed productive can take place.
Khump: "i can't concentrate right now, i'm totally caffiending"

BLaz: "get out of my office and go to the starbucks across the street"
by Khump January 05, 2011
 
2.
To need some sort of a caffiene fix
Dude, this hangover has got me caffiending
by Penny89 September 05, 2009