Short for Chinese Communist and sometimes Chinese
Communications (military intel, not normal language), and also widely used in military terms to describe something Chinese such as a Type-56 assault rifle or a Chicom Bag and sometimes in general to things which pertain to asian communism. Chicom
originated out of the Vietnam War and was first used as slang for tiny burlap bags or packets which usually contained Chinese, NVA, or Vietcong made
communist propaganda as well as intel, ammo, food, medical supplies, etc.