Beer bongs are a quick way to get shitfaced beyond shitfaced. They're pretty simple:

A long hose, usually about 18-36" with a funnel attached to one end.

With one end of the tube near your mouth, covered with your thumb, beer is poured into the funnel and fills the tube. After getting most of the air bubbles and foam out, the thumb is removed and the tube placed in the mouth.

NOW SUCK IT DOWN! GO GO GO GO!!!

Some people claim to be able to "open their throats" and let the beer flow down. I have no doubt this is possible, but it's urban legend as far as I'm concerned. Most people just drink as fast as they can, which usually isn't fast enough. Beer gets all over the damn place.

Like I say, you can get pretty fucking drunk using these. A bong virgin will sometimes spew all the beer right back up after gagging.

Really fancy beer bongs will have a nice, large diameter tube, big funnel, and a valve at the mouth end so you don't need to depend on your thumb, in case you get too drunk to maintain motor skills.