When I was in high school, a kid skipped class and walked through a wooded park by the school and three other kids followed him, beat the shit out of him, tore his gauges out, and then proceeded to light him on fire.
KIDS BE SCARY
(Source)
The term is often seen on internet forum as a remark to say kids are scary, I guess.
Is this a specific hip term or what does it mean to use "be" as the verb instead of "are"/"were" in this kind of construction?