When someone shits in your bed.
Oh wow man, Amber must be pissed off, she did a heard alert in my bed.
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The phrase used to warn others of a manipulative, abusive, narscissist romantic partner who will do anything to destroy their partner's/ex-partner's life to the point of lying in court and defaming the victim's reputation, at all costs.
That dude is a total Heard Alert, man. All he does is lie about his girl and treats her like crap.
Used when your crazy ex-girlfriend walks into the room
I was sitting at the bar having a drink with my friend and he says “Heard Alert”. I turned around to look and my crazy ex-girlfriend was there.