"Throw thing" is two separate words with distinct sounds. "Throw" is spelled /θroʊ/ and pronounced with the voiced dental fricative /ð/ followed by the rounded back vowel /oʊ/. "Thing" is spelled /θɪŋ/ and pronounced with the same voiced dental fricative /ð/ followed by the front vowel /ɪ/ and the velar nasal /ŋ/. This combination of phonemes results in the distinctive sound of "θroʊ θɪŋ," which conveys the action of throwing an object without specifying what that object might be.
The term "throw thing" does not have a specific etymology as it is a combination of two generic words, "throw" and "thing".
The word "throw" originated from the Old English word "þrawan", which means "to twist, turn, rotate". Over time, it evolved to encompass the meaning of hurling or projecting something through a pushing or launching motion.
The word "thing" has its roots in the Old English word "þing", which referred to a public assembly or meeting. In modern usage, "thing" has taken on a broader meaning and is often used as a generic term to refer to an object or an unspecified item.
Therefore, when combined, "throw thing" simply refers to an object or item that is being thrown or projected through the action of throwing.