It's a black/brown liquid substance, usually served hot in something called
a "coffee mug" or cup. It comes in more flavors than some desserts
I know of, but it all comes down to two basic flavors, really: leaded or unleaded,
regular or decaf.
If you've never had a cup o' joe, then you're in for a big surprise- it's
addictive. Woefully so. Cigarettes at least get to taste horrible most of
the time, but coffee can be as sweet as ambrosia and twice as effective. One
cup can perk you up, but just as with any drug, you can build up a tolerance
to it. If you're addicted, by then, just give up to it and try to use some
self-control. Three cups, for me, can leave me with the shakes and a queasy
stomach for hours. That said, I still glut myself on it whenever I go to Café
Coco. Thank God I don't keep any in the house or own a coffee maker!
A cup o' joe, really, though, is a sign of fashion and style more than
anything else. You could say "cup of coffee", but that has
the same sort of interest and appeal as calling someone a "penis"
when you really wanna call 'em a "prick."