Of course it is proper to use 喂 outside of a phone conversation. 1. If someone is impolite to you or say some dirty words to you , you can respond : 喂， watch your behavoir or watch your mouth. 2.Mum feeds her baby : the young lady is 喂 her baby with milk. 3. When you think something is outrageous , you can say : 喂，this is too outrageous . and bla bla bla ................... anyway , 喂 is a model particle in most of conversations , but it can be a Verb , too ，such as 喂 baby . hope this can help you understand it .

喂 (wei 4 ) can be a verb . which means feed. 喂 ( wei ) can also mean " hi " or " hello". When making or answering a call, it is used to start the conversation. In daily life, 喂 is a little bit rude and too casual to get the couterpart's attention and start the conversation. I can only be used between friends who will not mind your being not polite and for fun.

喂(the fourth tone) is just used to your friends,not to your boss ,your 长辈.It is rude. By the way,how to say 长辈 in English ? Anyone can help me ? Thank you in advance.

哦。我明白。:)

haha~ Taiwan drama