v. In the computerized offense report system for a major urban police department in southeast Texas, there is a drop-down list of actions a suspect may perform during the commission of a crime. #55 is "Tongue Anus." To "fifty-five" someone means that they are so incredibly hot that you'd even consider performing an act that you'd otherwise never do.
Guy 1: "Whoa! Check out that chick who just walked in!"