A vile sex act when you have sex with a girl while she is on her period, then take your dick out and slap her in the face with it, while promptly shooting your load in her eye.
1. To think something is cool and do it, and then realize after being made fun of that it is probably the least cool thing you could've possibly done.
2. To fix something that is not broken, change something that doesn't need to be changed... etc.
3. Quite possibly, the gayest gamertag ever to grace xbox live.
Kris: Do you like my new halo reach emblem?
Jordan: Dude you just gunslinger lore'd it... You had a sweet looking zombie with a pimp hat and now you have a gay looking skull inside some stupid shield... way to pull a "gunslinger lore".
The three main characters from the Spaghetti Western titled "The Good, the Bad, and the Ugly". Played by Clint Eastwood, Eli Wallach, and Lee Van Cleef. Arguably the most badass group of characters in cinema history.