This is a pejorative term used to dismiss any moderate or liberal GOP members from getting nominated to run for president.
Any Republican who isn't a pro-life creationist who denies climate change gets hit with this label.
Defn: A kind, loyal man with impeccable values who makes people of all ages, from infants to seniors, feel comfortable. He's instinctively loving and caring, and, above all else, he wants those he loves to be happy. He's hardworking to a fault, and loves a good competition.
Currently, it stands for any Republican who is not totally bat-shit crazy on 100 percent of the issues, 100 percent of the time.
Person B: "Oh, he's not a RINO, he just doesn't think schizophrenics should be allowed to carry assault rifles into schools!"
Person A: "That's not right! The Second Amendment says we can carry anywhere!"
Person B: "Sure it does - if you're bat-shit crazy!"