a real mother

Instead of newer genres, it's more an older, rough, tough 'biker' usage... for someone to be wary of, aware of, watch out for, cognizant of... used informatively, often as a warning.
sarcasticly - similar to 'a real nice guy', 'a real sweetheart'

"You'd better watch out for that one, he's a real mother... "
mo-fo

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