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It's basically the act of tea-bagging. One takes their genitalia and drops into anothers mouth/face. Often done while the other person is passed out with their mouth open. Pictures will certainly ensue.
Hey, do you want to come back to my house and schifferdecker?
Dude, you totally schifferdeckered his mom!
Jon got schifferdeckered.
by Pat Cribbs December 22, 2005