The act of sitting on a girls face, with your balls resting on her eyes as if shes peering through the lens of a periscope, while she simultaneously jerks you off.
When you press your butt against a hard, flat-surfaced chair and fart, but there is no place for the gas to escape except up the crack of your ass. and out at the top.
Dude, I laid the biggest periscope fart in detention. I press my butt cheeks against the hard chair and farted and the gas came bubbling up the crack of my ass and peeked out at the top!
Any one of several a.i. machines in the form of humans (mainly female) that were created to serve their owner by performing simple to complex activities. The usefulness of a persocom is directly proportional to its size. The larger persocoms are capable of emulating comlex emotions and have self learning capabilities.