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.