I never heard of this word until last week.
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Butt-Dial means accidentally dial someone’s phone number while sitting on your phone. It happens when you are sitting down while your cell phone is in your pant’s back pocket. It is also known as pocket dial. It usually dials any of the last 3 numbers you have dialed.
When this dialing happens, the receiver can hear all the conversations you are having with someone else in the room. If you are not talking to someone, the receiver will be wondering why you dialed him/her and did not speak.
Side Note: Last week, President Trump’s personal lawyer Rudy Guiliani’s cell phone butt dialed an NBC News Reporter. At that time, Mr. Guiliani was speaking to someone else, someone in the same room. This reporter heard the whole conversation and published the entire conversation. I think this is unethical.