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1.
An email, text message or other form of non verbal communication that conveys the desire to have sexual relations to a friend that you are interested in, or will be, cutting off ties with soon, as a sort of "Hail Mary" on the friendship. It's further implied that no reply is needed if the answer is no. Surefire way to end friendships, or make them that much better.
John: Hey, you still friends with that girl, Jenny?

Mark: (laughs) Nah, I dropped the FriendEnder on her. Haven't heard from her since.
by Kishoto April 24, 2013