Caps lock voice refers to the authoritative and raised tone used by a normally calm and quiet person when he/she has had enough of someone or something. It is the equivalent to using the caps lock key in the digital world to show your strong emotion.
Caps lock voice指平时冷静沉默的人在对某人或某事忍无可忍的时候转而采用的一种提高了音调且颇有威慑力的说话语调，这种方式相当于在网上聊天时用全部大写的方式表达自己激烈情绪，所以，就叫“大写锁定语调”。
Sara tried to get an attitude with me yesterday and I had to turn on my caps lock voice and put her in check.
Chris was being run over at work, so Jason told him it was time to turn on his caps lock voice.
People voice is the voice that someone uses when talking to strangers or people they are not familiar with. This voice is automatically happy, nicer and sweeter than their normal voice. It is often with a higher pitch. This is often the voice people use when answering a phone call or when working in retails.
Girlfriend voice refers to the change in pitch or tone of a man's voice when talking to their significant other. The girlfriend voice is characterized by a higher pitch and a more effeminate tone with speech patterns scattered with pet names and childish words.