When someone of mass size is unable to breathe through their mouth due to excessive fat hanging (triple necks), so their body struggles to survive by allowing certain stretch marks to form into gills to absorb and intake oxygen
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Get the loochmas gifts mug.Very drunk. In British slang, "pissed" means drunk (not angry, like in the US), so pissed to the gills is like being so drunk, you're SWIMMING (hence, the GILLS) in alcohol.
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