Dabbing (1) - Vaporizing concentrated marijuana, usually in the form of wax or hash, by placing it on an extremely hot
metal object called a
nail and inhaling the vapors produced. The
nail is usually
heated via blowtorch. Inhaling this
harsh and concentrated form of marijuana often causes one to cry and wipe one's tears away while coughing and passing a bong.
Dabbing (2) - Performing the dance move characterized by raising an elbow and tucking one's head toward that elbow while raising and extending the opposite arm behind. This dance move is often seen while dabbing (1) since the dabber immediately coughs into his inner arm and wipes his or her tears away while passing a bong. See attached .gif image.