"Obama" is a southern Scotland term, used as a replacement for the Chaos god "Tzeentch."
This primarily came about due to President Barack Obama's common references to "change," and thus people now use this as a humorous name for anything related to Tzeentch. Only cases of this known have occurred in Scotland.
It is NOT used as an offence to Americans who strongly hate Tzeentch but love Obama: thats just plain sad.
Player 1: "What list are you using today?"
Player 2: "My Obama list"
Player 1: "Wow, cool model, what Mark does it have?"
Player 2: "Mark of Obama"