The story
Pseudo-Japonism, from Japanese おっぱい (oppai, “breasts”) + loli. Compare the Japanese term ロリ巨乳(きょにゅう) (rori kyonyū)
Etymology from Wiktionary, CC BY-SA 4.0.
oppai loli
Today it means: A character in fiction with the frame of a loli but with a disproportionately large chest. Full definition →