/kupo could make your character say "kupo" in various ways - depending on factors like your character's chosen voice number and gender.

Similar emotes might include:

/sing: good supplemental emote for Bards (maybe not every voice option is a singer's voice - could be funny); you could even have a /sing1, /sing2, and so on for multiple songs... (I'm envisioning a "Walk Free" /sing emote for next year's anniversary!)

/roar: suitable for Miqo and Roega in many situations, but hilarious (and often suitable) for Lalafell too!

/kweh: need I say more?