Ma
来自Big Physics
early 19th century: shortening of mama.
wiktionary
ma (plural mas)
The sound, which parents interpret as a reference to themselves, is very commonly made by infants.
Abbreviation.
From my
From Chinese 嘛 (ma, “of course!”). [1]
etymonline
ma
childish or colloquial shortening of mamma, by 1823. "Also applied colloq. to a middle-aged or elderly woman, esp. one in authority" [OED].