ò
oh (interjection indicating that one has just learned sth)
This is a grammatical particle — its meaning comes from how it's used in sentences, not from its components.
吟哦
yín é
to chant
哦豁
ò huō
(dialect) oops!; oh no!; oh snap!
哦买嘎
ò mǎi gā
(loanword) oh my God!