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Definitions of SPG:
noun: (military) Initialism of self-propelled gun.
noun: (cooking) Initialism of salt, (black) pepper, and garlic. [A common substance, chemically consisting mainly of sodium chloride (NaCl), used extensively as a condiment and preservative.]
noun: (Singapore, derogatory) Initialism of sarong party girl. [(Singapore, derogatory) An Asian girl who dates a non-Asian, especially a white expatriate.]