Hard-boiling occurs when a person sends a message digitally (text message, phone call e-mail etc.) and the recipient does not want to respond. One may not know they are hard-boiling another until it is already occurring. The recipient who chooses not to respond is thus 'poaching'.
Text Message "Hey Ethan, I think you should lose the mustache." Ethan's response? Didn't even pull his phone out of his pocket. You are straight up Hard-Boiling Ethan.