A clueless touron from Pennsylvania (nickname: the Keystone State), usually from some obscure small town in central PA, who vacations in Ocean City in the summer and drives like a complete and total jackass on Coastal Highway, blocking traffic by going 20 MPH or less, not paying attention to anyone else around them, and cutting across three lanes of traffic without warning to make a turn (a.k.a., a "Pennsylvania left-hand turn"). They are also infamous for asking idiotic questions like "Where's the beach?", "How do I get to the Boardwalk?", and "Have you ever heard of a place called Seacrets?".
"Dude, some keystoner just pulled a Pennsylvania left-hand turn on Coastal Highway and caused a three-car accident."

"Some keystoners just asked me how to get to the beach."

Can also be used as an adjective: "I would have been here a half hour ago, but I got keystoned on Coastal Highway. Damn tourons." (keystoned = surrounded by keystoners going 20 MPH, and unable to pass.)
by OC Local June 7, 2007
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A band from Philadelphia, PA.
2008 - present
Influences: Rock, Blues, Jazz, Prog, Singer Songwriter, etc.
myspace.com/keystonedmusic for more information
Keystoned is a great band.

I got keystoned last night at the show!
by Watts2k May 2, 2010
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The keystone shit holds all the other poop in place. Once the keystone poop falls, the entire doo-doo infrastructure will eventually follow. The keystone is the densest shit and thus requires the most attention and concentration.
Sweating on the toilet, I put on the Led Zeppelin song "When the Levee Breaks" and waited for the keystone shit to drop.
by asthmaticdan September 4, 2015
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When a plate of loaded nachos is delivered, the "keystone nacho" is the nacho chip that, when lifted from the platter, pulls the largest amount of toppings from the plate at once. The person who pulls the keystone nacho is hated, respected, and envied by all others at the table.
Comer found the keystone nacho and in one moment, he got the best bite of the whole dang plate!!
by Glamrockster December 12, 2016
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term used to describe an inept group of people for their mistakes and/or lack of coordination and/or inability to get things done. Comes from a series of silent movies made by the Keystone Film Company between 1912 and 1917 about a group of incompetent policemen and their various escapades.
I don't know about you, but in the past few years, it seems to me that every time there is a major crisis, the government runs around like the Keystone Kops!
by y0ur l3ft nut May 24, 2010
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A rancid, liquid bowel movement after drinking too many Keystone (or Stones for short). Usually starts with a Questionable Fart or two, followed by rumbly in the ole tummy.

Then, the victim experiences a few convulsions, perhaps even a full blown seizure. Then all hell breaks loose, with a violent powerful ass blast with the consistency of Spackle or paint. The victim then angrily vows never to drink Stones again, but usually succumbs later on.
Gordon stopped by his apartment to get just a little taste of some crack. He quickly freebased a few hits, gobbled a few Loratabs, and slammed 16 Keystone light beers.

He was eagerly anticipating the toga party with hot co-eds. He changed into his white toga and went on his way. About halfway to the party, he experienced a Keystone Brownout in the car and had to terminate his plans.
by Jrubadub February 11, 2012
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Keystone beer is a product of the Coors Brewing Company in Golden, Colorado. It was first introduced in Chico, California in September of 1989. Due to its relatively low price, it is popular among college-aged individuals. Keystone can be found in can, keg, and occasionally bottled form.
Am I drinking a can of piss? Oh, it's just Keystone Light.
by macpj March 28, 2008
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