zo'oro'u _UI* cmavo-compound

Attitudinal: innuendo/sexual wordplay marker (the "sexy ;) " emoji).

On grammatical class:

ja'onai (comp!): discursive/evidential: after all...
ji'acu'i (comp!): discursive: continuing/extending/belaboring the point
ji'anai (comp!): discursive: returning to or correcting a previous point, moving back in the conversation/discourse
ju'aku'i (comp!): evidential: although, even though, while, whilst
po'onai (comp!): discursive: not exclusively, among others, including but not limited to.
va'icu'i (comp!): discursive: in the same words.
zo'oro'u (comp!): Attitudinal: innuendo/sexual wordplay marker (the "sexy ;) " emoji).