Sorry for any gender misidentifcation issues - they do tend to happen on the net...
Skipping is a really short skid to cut speed - up with the back wheel, put it back down moving backwards if possible. Your legs may not always be able to counteract the forward momentum once the wheel is down, but it takes a lot off of your speed. You don't always have to stop to avoid an accident, anyways...
Practicing skidding to a stop is reccomended by 1/1 drunken brakeless riders as something to do in a parking lot or park with no traffic late at night. There are for mor pressing matters when you are on the bike than doing a sweet 40 foot skid (which I can't do anyways). Stay alive, and keep in your abilities.
Dammit, am I going to have to change my status back to 'Clear Blue Reason'? That is really not the state of my mind right now...