noun

• (historical) One of a band of assassins formerly active in northern India who worshipped Kali and sacrificed their victims to her.
• (African-American Vernacular) One who, usually as a result of social disadvantage, has turned to committing crimes (e.g. selling drugs, robbery, assault, etc.) to make a living; a gangsta.
• (horticulture) An overvigorous plant that spreads and dominates the flowerbed.

verb

• (informal, transitive) To commit acts of thuggery, to live the life of a thug, to menace, to commit crime.
  "Mr. Ingleby ascertained at the office—after threading the mazes of passage and staircase as though he expected momently to be Thugged—that his nephew had not yet come."
• (informal, transitive) (often with out) To appear as a thug; to dress and act in a manner reminiscent of a thug.
  "I don’t thug out, but I’m not Wall Street, either. Russell Simmons and Puffy have clothes for this look in the affordable range."