THUG (thg) n. 1. A cutthroat or ruffian; a hoodlum 2. also Thug One of a band of professional assassins formerly active in northern India who worshiped Kali and offered their victims to her.Thug T-Shirts Printed on 100% Pre-Shrunk Cotton T's with Old Engligh Writing and Brass Knuckle Print. Available in Sizes M -XXXL Embrace your inner thug!