Sensai-Slap
To hold your dick in both hands and slap your beloved across the face, as if you were chopping off their head.
"Hold your head up so that I can't Sensai-Slap you with my sword!"
"Jack Sensai-Slapped the shit out of me the other night and I can't move my neck!"
"Jack Sensai-Slapped the shit out of me the other night and I can't move my neck!"