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.