First off, here's the Millennium Falcon:
Next, a little background. In Star Wars: A New Hope this exchange happens:
Now, here's the problem... a parsec isn't a unit of time, in fact it's a unit of distance. 1 Parsec is equal to 3.262 light years, another distance. I know what you're thinking, you're thinking, "But wait? Parsec sounds like a unit of time... so does lightyears..." Well, you're wrong. Cause those motherfuckers are units of distance. A lightyear is the distance covered by something going the speed of light for a year, and a parsec is a the motherfucking distance from the Earth to a star that has a parallax angle of one arc-second.
Han Solo: I'm captain of the Millennium Falcon. Chewie here tells me you're lookin' for passage to the Alderaan system?
Obi-Wan: Yes indeed, if it's a fast ship.
Han Solo: Fast ship? You've never heard of the Millennium Falcon?
Obi-Wan: Should I have?
Han Solo: It's the ship that made the Kessel Run in less than twelve parsecs. I've outrun Imperial starships. Not the local bulk cruisers mind you, I'm talking about the big Corellian ships now. She's fast enough for you old man.
Let me boil that down: a parsec is a fucking ridiculous huge distance.
So essentially Han Solo is looking at the old man and saying: "The ship is fast enough for you! It went a really long way!" Which when you think about it makes absolutely zero sense.
There are a lot of theories as to how this poorly written piece of dialogue could make sense... and I've done a shit ton of research and we're going to figure out once and for all what the shit George Lucas meant.
[Dr.] Dru Johnston, the only astronomer who earned his doctorate from the school of hard knocks.