A treacherous, nasty, dangerous person or thing you should steer clear of.
I avoid visits with my wife's family as my evil mother-in-law is a rolling ball of butcher knives.
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getting things moving with a potential partner/ball roll
Joe: “Ayo Glenn you should go get the ball rolling with that girl”
Glenn: “Sure thing there Joe”
Someone who is sharp and all over the place; a live wire
She’s been a rolling ball of butcher knives managing this hospital of Covid patients.