Dunk it and junk it Share definition Flag casual sex you intend to have with another person with no intention of contiuing a relationship. Most likely a one nite stand. Most likely said to a friend about a hot girl. Man, do you see that ass? I'd dunk it and junk it! Dunk it and junk it by aldeshsa May 5, 2009 Get the Dunk it and junk it mug.