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The term was coined in episode 11 of Frisky Dingo. It is the act of wearing a beer can for pants.
Torpedo Vegas: I'm getting furious at you, you don't even have any pants on.
Xander Crews: Neither does he!
Torpedo Vegas: Well he doesn't have a penis! As far as I can tell...
Killface: I - uh -
Xander Crews: Yeah, what is the story on that?
Killface: Oh, like you can talk.
Xander Crews: Hey, my penis fills an entire tall-boy.
Quick cut to Xander, as Awesome X, dancing in front of the X-ticles, naked except for a beercan covering his groin and shouting "Master Cylinder!" through a megaphone. Cut back to Torpedo Jones' lair
Torpedo Jones: Scoffing I'm sure it doesn't fill it.
A 24oz can of Malt Liquor sometimes referred to as a tall boy. The original Schlitz Malt Liquor had the words "Master Cylinder" written down the side of the can.
More recently it has reappeared on a show entitled Frisky Dingo as a form of pant.
"Gonna get me check, get me a master cylinder, and get f*cked up!