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1.
A CareBear gone evil.
Sometimes I have nightmares that my CareBear will turn into a ScareBear overnight and murder me.
by Angelacia May 01, 2007
 
2.
a bear that is very frightening, like a derranged care bear.

Often a nickname for others.
While the care bears are cute and happy, scare bear is frightening!
by Scare Bear March 05, 2009
 
3.
Using ones breasts and nipples for frightening attacking bears as they appear as large eyes, thus confusing and intimidating the bear. Similar to animal mimicry like "false eyes" on a butterflies wings.
It's an attacking bear, I will use my scarebears on the bitch...behold!
by scarebearanalyst October 01, 2010