To have too much caffeine in your system to a point where you can no longer have proper train of thought.
Jim : "I guesstimated that!"
Karl : "what's guesstimation dude?"
Jim : "It's like guessing and estimating.......I don't know im really caffinated right now!"
Karl : "Take 5 Jim!"
"Terry needs to switch to de-crack if he's ever gonna be calm enough to sit through the board meetings.", "How do you like your coffee? Crackinated or de-crackinated?"