Plural of butter bar, derogatory term for the lowest ranked commissioned officers-eg. second lieutenants or ensigns, who wear rank badges of bronze or bronze colored.
Master Gunnery Sergeant: Hey, congratulations on your promotion, Major. Ever noticed that your fig leaf is the same color as butter bars?
Major: Uh...
A clever nickname you give your friend when they are being silly and you’re feeling funny . This nickname can be used when you feel like it. This nickname is a good connotation so you want to be a peanut butter barfey baby.