Look up spag in Wiktionary, the free dictionary. Submarine Parachute Assistance Group of Britain's Royal Navy, assists in submarine rescues Anthony "Spag" Borgatti (1916–1996), founder of Spag's discount store in Massachusetts St. Petersburg Immobilien und Beteiligungs AG (SPAG), a company suspected of links with the Cali Cartel organised crime group Spelling, punctuation and grammar Sperm-associated antigen, human proteins, including: SPAG1: Sperm-associated antigen 1 SPAG5: Sperm-associated antigen 5 SPAG6: Sperm-associated antigen 6 SPAG7: Sperm-associated antigen 7 SPAG8: Sperm-associated antigen 8 SPAG9: Sperm-associated antigen 9 SPAG11B: Sperm-associated antigen 11B