3.A generic insult. It can mean bad, stupid, whatever you want it to mean.
Don't say that something is gay as an insult. I find this highly immature, mostly because it is often used when people can't think of a proper insult even when there is nothing homosexual about whatever they're insulting.
1.Jeremy was in a gay mood after getting an A on his test.
1)Year 2000. (Y=year, 2k=2 times k, k being short for kilo which means 1000)
2)Computers only counted the last two digits of a number, so they didn't know the difference between 2000 or 1900. This would cause various problems with dates and finances, and would cause a big mess. People were panicking and saying that when 2000 rolled around, all the computers would crash and the nuclear bombs would go off or something.
A long time ago (I believe the 80s) there was a game show in Japan called Takehashi's Castle. 100 people would try to take over a castle, but to get to it they'd have to go through obstacles, most of which were extremely dangerous and extreme, and if you lost the game you were eliminated.
Years later, Spike TV took the show and turned it into a show called Most Extreme Elimination Challenge, or MXC. They dubbed it badly with funny, often perverted commentary by the two host Vic Romano and Ken Blankenship, and edited out the prizes and things like that.