1. Saving a few seconds at a long red light via elaborate and questionably legal maneuvers.
2. Having someone call your cell phone to figure out where it is.
3. Calling the Ackermann Function with Graham's Number as the argument just to horrify mathematicians.
4. Instinctively constructing rules for which floor tiles it's okay to step on and then walking funny ever after
"That is so XKCD."

xkcd.com
by sigma419 April 13, 2007
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"A webcomic of romance,
sarcasm, math, and language."

xckd is an online Comic Strip that airs a new comic every week. It is one of the more popular comics. Most of them are related to math, computer programming or the internet.
Andy: Hey Chris, you check xkcd lately?
Chris: No, why?
Andy: They ran this one about Python. Ya know, the language.
Chris: Yeah? I'll check it out. Those xkcd comic are always funny.
by fib12345 December 15, 2009
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A web-comic where they often have recurring characters, like a girl with black hair who is sometimes referred to as Megan, Stacey, or Cutie, a guy with a beret, a guy with a black hat, a guy with a white hat, a plain bald guy who is sometimes referred to as Rob or Cueball, a black haired computer hacker which is named HelpImTrappedInALicencePlateFactory, and her brother which is named Robert'); DROP TABLE Students;-- or little Bobby Tables or just Bobby. If you roll your mouse over, you can see another message. TRIVIA: If the alphabet is assigned numbers such as a=1, b=2, so on, so forth, xkcd would total 42.
A recent xkcd comic.
*Two guys riding on escalator*
1: This is a long escalator.
2: 70 meters. longest in the world.
...
1: Why are you carrying a chin-up bar
2: Why aren't you wearing a hat?
1: I'm not really a hat person.
2: And I'm not really a not-carrying-a-chin-up-bar person.
...
1: Seriously, why did you bring it?
2: How should I know? I'm not a psychologist.
*Reaches top*
*2 installs chin-up bar at waist height on the escalator*
ROLL-OVER TEXT: Those few who escaped found the emergency cut-off box disabled. The stampede lasted two hours and reached the bottom 3 times.
by aslal1 September 25, 2011
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Pronounced Ziksid;
It is any string of four letters without a pronunciation.
xkcd was originally a xkcd before this definition and subsequent pronunciation were attached to it.
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An online comic strip catered towards geeks/math majors/etc. Makes the fatal flaw of assuming that because it has a niche audience, it will automatically be funny. On the contrary, it is rarely amusing, and is only popular due to said audience's lack of recognition in most mediums.
"The vector of c is 5."

"Hahah! I think that that comci, xkcd, is funny because I automatically approve of anything nerdy. I also love the dick."
by ipwnzurmominthenight March 31, 2008
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An extraordinarily colossal number that is calculated by calling the Ackermann function with Graham's Number as its parameters.
The actual value xkcd's number is unknown as most mathematicians cannot grasp its true form without suffering from PTSD-inducing nightmares.
by Ἀπολλύων September 17, 2016
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