馱獸，又稱工具人，意思係指為左討好「自己嘅」心儀對象而甘心為對方無償做事嘅人，喺華語地區各地有馱獸、觀音兵、舔狗、火山孝子、騎士團等類似嘅稱呼。馱獸原本係指指訓練用黎背負物品或者比人騎乘嘅動物（見動物運輸）。在中國大陸網絡嘅文化，舔狗意思係對愛慕對象噓寒問暖以求回應嘅人，即係好似隻狗咁跪舔他人  。而喺香港呢啲男人又稱為觀音兵（好似觀音座下嘅侍從小仙咁樣任由差遣）  。「觀音兵」呢個字詞歷史久遠，喺香港俚語中用黎形容某些男性為了追求女性，而不顧一切為該女性做各種事情 。後來此詞引申至互聯網論壇等虛擬社羣。被人崇拜的女性稱作觀音、娘娘或女神，即源於「觀音兵」一詞 。喺臺灣的網路文化中，接受奉獻嘅對象通常會比人稱為公主、女神，而奉獻者常被比人稱呼為火山孝子或騎士團。
Lin Beast, also known as tool man, means a person who is willing to do things for the other party for free in order to please "one's" favorite object, and there are similar names such as Lin Beast, spare tire, licking dog, volcano filial son, knights, etc. in various parts of the Chinese-speaking region. Originally, it referred to an animal that was trained to carry objects on its back or ride on a human (see Animal Transport). In the culture of the Internet in Chinese mainland, licking a dog means a person who shushes the object of affection in response to warmth, that is, kneels and licks others like a dog. In Hong Kong, these men are also called spare tires (like the attendants under the Guanyin throne are sent by Xiao Xian). The word "spare tire" has a long history, and is used in Hong Kong slang to describe the desperate fact that some man does anything for a woman in order to pursue her. Later, the term was extended to virtual communities such as Internet forums. The women who are worshipped are called Guanyin, Niangniang or Goddess, which is derived from the word "spare tire". In Taiwan's online culture, the recipient of the offering is usually called a princess or goddess than others, and the devotee is often referred to as a volcano filial son or knight.