Lofterbation
The act of masturbating while in one's dorm room lofted bed, with or without roommates present.  The lofts must be so high above the ground that, upon ejaculation, the discharge sticks to the ceiling.  
After returning from class, I noticed the jizz dripping from the ceiling and immediately assumed Fat Jimmy had been lofterbating.

I took one look at my roommate Jim Nugent and was forced to hop in bed to lofterbate.  

My erectile dysfunction doesn't allow for lofterbating.  

After bombing my Orgo test, I ran back to the dorm for some quality lofterbation.

With four guys in one room, lofterbation is so frequent that we painted our ceiling white.