The mysterious substances, stains and splotches that can be sometimes found in/on used video games, video game instruction manuals and video game cases.
I wanted to borrow Modern Warfare 2 from him, but there was so much Fanboy Skeet on the disc that it'd take turpentine to clean the stains off.
The act of miming the motion of a male masturbating, and continuing said act with the motions of hypothetically projectile-ejaculating towards a specific target.