A legal stimulant that is found in coffee, soft drinks and energy drinks and there is the pill form. Normally ingested in drinks but can be swallowed in the pill form or the pill can be crushed to powder for snorting and even cases of "slamming". Caffeine is as strong as amphetamines but does not cause wicked behavior as, cocaine, meth or other drugs but too much caffeine at one time can get a person high and can "tweak" a person out.
Pepsi, mtn dew, coffee, monster drinks all contain caffeine. Too many monster's can twack a person out.
by jackson, j May 26, 2006
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vb. to take on caffeine, esp coffee, usually in the morning as part of a regular routine
Boss: There you are, let's get straight down to work.

Employee: Not so fast, I gotta caffeinate first!
by m f luder August 21, 2011
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Its like high-octane fuel for the brain. Its a vitamin.

Found in guarana (only good if you want a nice drink, if its only for the vitamin, then its overpricy) but mostly coffee of course. Supplements like No-Doz pills have actually their caffeine from coffee decaffeinator byproducts.
Chocolate contains too much calories to be acceptable as source of caffeine.

To get the RDA in caffeine if you don't like coffee drink Diet Coke/Pepsi/etc.

Useful info now. Caffeine doesn't act like coke or speed! It doesn't act on the same pathway! Actually it mainly blocks the "drowsiness-inducing molecules" a.k.a adenosine from acting. But it doesn't act of dopamine (=feel good) pathway like the other drugs.
by QuartzRox March 28, 2004
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To fein for have a strong urge for caffeine
Debra: Lets stop by starbucks coffee I am Caffeineing so hard

Lisa: But you just had coffee

Debra: Did I ask you? No now shutup and let me get my dose
by JTATslave1914 May 29, 2011
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A person who drinks a lot of coffee, probably is addicted to caffeine and hates decaf.
"What? That's your 5th cup.

You are a caffeiner, aren't you?"
by seiju December 25, 2017
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Caffeine , the most awesome invention of man, it allows you to stay awake for days at end. It have helped students finish homeworks the night before turning them in. Also it helped to create the wounderfull drinks we all love like coke and Coffie . Truly this substance is the best thing ever.
There is some Caffeine in in your coke, drink it.
by The lord of the dance. September 12, 2009
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