The clip comes from Brazilian YouTuber Inutilismo in his video titled Um Filho Irritante, where the line appears around the five minute forty one second mark. Inutilismo built a large Portuguese speaking audience on YouTube with exaggerated reactions and everyday rants, and short excerpts like this were pulled into soundboards and meme edits. Because mas que merda is a common frustrated expression in Brazil, the shout travels easily beyond the original video and gets reused whenever creators need a quick, recognisable outburst in Portuguese.