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A fancy way of saying 'almost all' but with more bragging and less effort.
'This sanitizer kills 99.99% of germs!' Like, bro, I've seen less than 1% of germs survive a middle school lunch table.
My mom says Germ-X is the reason I don't have a third eye from all the bacteria.
I don't care if it kills 99.99% of germs, I'm still gonna get sick because I eat expired pizza.