"Soyboy" is a loosely-used term for men who, to varying degrees, do not fit into a traditionally masculine archetype. It originated from an urban legend that proclaims soy food products contain estrogen, and as a result, vegan men who consume soy as substitutes for dairy and meat typically have high levels of the growth hormone. The term's use is historically correlated to political trends on the far-right, as modern far-right movements often co-opt high-meat diets and milk drinking as a cultural identity. Sometimes, this fits into white supremacists' pseudoscientific narratives that white people's tolerance to high-dairy and meat diets is evidence of ethnic superiority.

However, the term is used quite broadly today, including in satirical and ironic settings. Most appearances of the term are not indicative of far-right politics or hateful ideology.