The clip circulates online as a Spanish language reaction sound built around the contrast between a wholesome phrase and a vulgar ending. 'Soy feliz' simply means I am happy in Spanish, while 'hpta' is a shortened written form of a common Latin American swear. That clash is why it spread in chats and short videos, especially among Spanish speaking users who use it as an exaggerated happy reaction. It works both sincerely for big wins and sarcastically for tiny victories.