Noun The act of pleasuring oneself while doing something else.
My girlfriend walked in while I was multi-jacking. I had porn on the computer and CNN on the TV.
Multi-Jacking: define #2
The art of masturbating whilst multi-tasking.
THIS SHIT IS INTERRUPTING MY WACK OFF BEFORE WORK TIME FUCK
Friend WACK OFF AND DRIVE TO WORK ITS CALL MULTI-JACKING