Short answer: “ching” can have several meanings depending on context, some benign and some offensive. Here are the main possibilities.

• In English musical and instrument terms: a noun meaning a small pair of finger cymbals used in Southeast Asian music (Thailand/Cambodia). It can also be a verb meaning to clink or ching (sound of metal or glass).
• In historical/dynastic terms: a transliteration variant for the Manchu-dynasty name Ching/Ch'ing, referring to the Qing dynasty in China.
• In offensive usage: part of a set of slurs or mock-Chinese phrases (e.g., “ching chong”) that caricature East Asian languages and are considered highly insulting and racist.

If you have a specific context (a sentence, a region, or a field like music history or linguistic studies), share it and the meaning can be narrowed precisely.