go-māṁsā-khādako yas tu viruddhaṁ bahu bhāṣate
go-māṁsā-khādako yas tu viruddhaṁ bahu bhāṣate |
sarvācāra-vihīnaś ca mleccha ity abhidhīyate ||
(Baudhāyana Smṛti)
“One who eats cow meat, speaks perversely and excessively, and is devoid of all proper conduct is called a mleccha.”