el huevo (testículo) the testicle. testicle [the ~] noun.

What do Mexicans call balls?

Huevos, cojones, pelotas. Huevos literally means “eggs” and pelotas are “balls”, but these words are also slang for “testicles” (cojones).

Is no Mames a bad word?

No mames is crude Spanish slang used to express disbelief (both positive and negative) or excitement. Used especially among Mexican Spanish speakers, the exclamation corresponds to “No way!”, “You’re kidding me!”, or “Stop messing with me!”.