What is what does it mean when a guy dabs you up?

When a guy "dabs you up," it usually means that he is greeting you or saying goodbye to you in a friendly or casual manner. Dabbing up is a form of greeting that involves tapping fists or hands together, usually with a quick, up-and-down motion. It gained popularity in recent years through sports figures and cultural icons and has become a common way for people to acknowledge each other in a cool and informal way. In essence, when a guy dabs you up, he is simply trying to connect with you on a friendly level and show that he respects you as a friend or acquaintance.