Victim: Uh, well see...(looking around) uh, BUDDY!
Friend/Wingman (shuffles over to the rescue): So, uh John, you left your laundry downstairs. Oh, then we're up for beer pong. LETS GO.
Victim: Wow thanks man...the buddy system never fails. Did you see her snaggletooth?
Usually applies to the "You help me, I help you" or the "Because we're buddies, you should totally do this for me" sayings.
Tom: "But Jen! What about the buddy system?!"
Jen: "...Alright, fine -_-"