The phrase is everyday Polish, with rybka being the affectionate diminutive for fish, which is why the line feels cute as well as hungry. Online it circulates as a short reaction sound detached from any single scene, shared on soundboards and dropped into Polish meme edits, food videos and chat jokes. Its appeal is the mismatch between the small subject and the big, satisfied delivery, so it works even for viewers who do not speak Polish but can hear the enjoyment in the voice.