Dick Slicker
A Dick Slicker, or slicker, is a condom, a "raincoat" or "Slicker" for your penis. Just as a rain slicker is worn to protect your body from exposure to unfriendly weather, a "dick slicker" is worn to protect your pecker from exposure to unfriendly snatch.
"If you're going to Jamie's tonight, don't forget the Dick Slicker. She spends so much time at the free clinic she has her own parking space.