Shiba or shibas means thing or things. The more common use is two or three shibas (shiba, shiba, shiba..), which means, shut up, or just a dismissive be quiet, that's enough. (depending on the tone of voice you say it in.)
"That's a big pile of shiba."
"Wow look at all the little shibas!"
Said to someone who is annoying you, "Oh, shiba, shiba, shiba!"
*usually followed with a wave of your hand in the direction of their face.
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