clubbing (Noun) — A condition in which the ends of toes and fingers become wide and thick; a symptom of heart or lung disease.
clubbing (Verb) — Unite with a common purpose. ex. "The two men clubbed together"
clubbing (Verb) — Gather and spend time together. ex. "They always club together"
clubbing (Verb) — Strike with a club or a bludgeon.
clubbing (Verb) — Gather into a club-like mass. ex. "club hair"