an interjection used to rid yourself of unwanted attention; if someone follows you around and hits on you and will not leave you alone, work the words 'peanut butter' into the conversation so that your friends know to bail you out.
guy 1: heyyyy, you know that sweater looks very nice on you can i get your phone number?
girl: ummmm... ya know, i really could use some PEANUT BUTTER over here!
guy 2: hey, um, she's my girl friend, back off.