Longman Dictionary of Contemporary English homepage

bluejacking

 noun
     
blue‧jack‧ing [uncountable]
the practice of using a mobile phone with bluetooth technology to send a text message to another person near you, without letting them know who has sent the message. This is usually done as a joke to surprise the person who receives the message.
—bluejack verb [intransitive and transitive]
—bluejacker noun [countable]
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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