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Expression originating from Hawaii. Shoyu is the other word for soy sauce; a salty dark brown dressing used upon white rice or Asian foods. Too much shoyu makes a good meal taste bad.

In the beginning of a female's menstraul cycle, the blood is often a tinged brownish color, similar to shoyu. It can be sticky, gooey, and smelly. It can turn a previously desirable hook up with a female into a raunchy, Jokable escapade.

If you combine a bit of shoyu with poor hygiene you get TOO MUCH SHOYU. Crusty, brown hard spots upon a thong pantie. Common amoung batuna chicks
Whoa, that chick was hot, but had way too much shoyu, brah
by Adderollic May 15, 2016
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