From the same initial letters.
- (US, military, euphemistic) buddy fucker, a supposed comrade whose actions harm his friends, often but not always, for his own benefit.
2013, Jeff Rose, Soldier of Finance: Take Charge of Your Money and Invest in Your Future, AMACOM Div American Mgmt Assn, →ISBN, page 26:
- We had a term in the military for a soldier who was not a good Battle Buddy. He was a "Blue Falcon." That rather odd name is an attempt to clean up a much more graphic term. The initials for Blue Falcon, "BF", were originally the first letters of a term I'll refrain from printing here. Let's just say that the "B" stood for "Buddy" and the "F" stood for a classic word of profanity. A BF was someone who screwed his buddies. We just called them Blue Falcons.
2007, David Axe, Army 101: Inside ROTC in a Time of War, Univ of South Carolina Press, page 31:
- To them, he's a Blue Falcon, a derogatory euphemism for "buddy-fucker." Blue Falcons are great soldiers when the commander's watching. But they'll screw you in a heartbeat when nobody else is around.