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1.
To be interrupted while performing the act of masturbation.
I was jerking off last night and got interrupted by someone. He was masturhatin'.
by Master Hate July 06, 2010
 
2.
To walk in on or otherwise prevent another's act of deeding/fingering.
Steve: *jerking off*
Bob: *walks in*
Steve: DUDE! I WAS ****ING JERKING OFF, YOU MIND?! QUIT MASTURHATIN'!
by irool July 05, 2010