Definition of poopsie in US English:

poopsie

(also poopsy)

noun

US
informal
  • A small child (especially a child of the speaker); a sweetheart. Chiefly as a term of endearment or affectionate form of address.

Origin

1930s; earliest use found in The Sheboygan Press. Perhaps alteration of popsy, after tootsy.

Pronunciation

poopsie

/ˈpuːpsi/