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.