1.Going on a double blind date with your friend and taking the girl he likes before you have defined who is with who.
2. You and your friend just met two girls at the bar and he's really hitting it off with the girl you like. He's goes to the bathroom and you ditch the girl your with and start talking to his girl. Talking smak about him the whole time, so you can get the hookup.
This can also be applied to girls
" Dude I called the blonde, you claim jumped on me."
" Get over it, there ain't nuthin wrong with a claim jump