An exclamation used when one achieves a great feat with his "shuga" (or girlfriend/fiance/wife), such as a great date, engagement, or marriage. What could be considered the ultimate shuga tuna is the honeymoon.
James: Did you hear about Terrance and his shuga? He proposed!
Ben: Oh baby, SHUGA TUNA!
by Obadiah Jenkins March 09, 2009

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