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!
A 9 year old fag whomst thinks he can do the act of jumping of an high place and doing (a usually) 360* turn and then proceed to shoot the target, usually in the head. In reality he just gets himself killed with his k.d being as big as your dick