(noun). A piquantly prosodic way to refer to a friend who is acting like a moron. Warning don't use this term in a real battle of urban-dictionary prowess given the self-humbling nature of using the prefix douche with the sharp suffix nip. As in there are many more blunt sounding and effective terms such as douche cock, douche cunt, douche fucker...
Me: "John you're a real douche nip"
John: "Wow I'm really not all that offended. You sure are a puss bitch"