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1.
Portuguese slang for «portuguese». It started out by being a derogatory term used by the African rebels during the Portuguese colonial wars (1960's - 1974). Ironically, it is now a word that overly patriotic portuguese use to refer to themselves.
«Estão ali mais tugas.» - Look, more portuguese people over there.

«Orgulho Tuga» - Portuguese Pride
by Marquis de Carabas July 05, 2004
 
2.
abbreviation of the spanish term for turtle, 'tortuga'. it is used to refer to a person with turtle-like characteristics, most commonly a back that resembles a shell.
Eres un 'Tuga
by koikoikoi January 11, 2010