Vacas magras is Portuguese for thin cows, and this clip leans on a Brazilian online joke that imagines calves slimming down with Monjaro, a drug widely discussed for weight loss. The phrase works as shorthand for lean times and extreme thinness, so creators reuse it whenever a visual already suggests someone or something has lost a lot of weight. Its appeal is not a famous film or song, but the instantly recognisable mismatch between rural animals and celebrity diet culture, which keeps it useful in short-form edits and reaction videos.