To fornicate a person, or being, without them knowing or noticing; Also slang for succesfully using the "date rape drug"
Ninja Fucker: "That blind girl had a nice rack last night huh"
Random guy: "Word."
Ninja Fucker: "I ninja fucked the shit out of here"
Girl 1: "Don't go to any parties at Will's house'
Girl 2: "Why not?"
Girl 1: "I heard Amanda got straight ninja fucked over there"
Smoov-e: "I'm a Ninja Fucking master"
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