Mooncake is the small, green alien companion from the animated series Final Space, which premiered in 2018 and follows Gary Goodspeed and his crew through space. Known for an innocent personality and distinctive vocal sounds, Mooncake became a fan favourite despite speaking in simple, expressive noises rather than full sentences. Short clips of those sounds, including this woaww, have circulated on soundboards and in fan edits, where creators reuse them as quick, recognisable reactions. The sound endures because it is instantly cute and easy to place in almost any lighthearted moment.