It is frequently seen in TikTok edits involving anime characters or VTubers reacting to unexpected events. Example Usage in Media

The popular Hololive VTuber is known for using similar flustered vocalizations during her gameplay and roleplay.

Characters in visual novels or RPGs often use "awawawa" in text bubbles when caught off guard. Shirakami Fubuki Quotes - Azur Lane Wiki

The phrase originates from Japanese (あわわ) to signify a stuttering sound made when someone is speechless or in a state of frantic confusion.