That sounds apt. They cause a giant ruckus when predators are around. They even dive-bomb predators that approach blue jay nests. Blue jays are members of the Corvidae family, which also includes crows and ravens. It is documented that crows and ravens can mimic human speech.
Some experts say crows and ravens can have larger vocabularies than parrots.
Experts also say that Corvidae have larger brains relative to body weight than other birds. Some Corvidae have even been observed making and using tools to probe for insects. I could not find, however, that any other blue jays had actually been observed using human words. So, maybe B.J. is unique. I did learn that experts do not advise trying to make pets of blue jays.