no manches

Spanish

Etymology 1

From no (“negation”) and manchar (“to stain”), conjugated as a command for tú (“you (informal, singular)”). Literally, "don't stain" or "don't ruin".

Phrase

1. (Mexico, informal) don't screw around, stop joking, stop being silly

   ¡No manches! ― Shut up! Are you kidding? Stop being an idiot!

   Synonyms: (Mexico) no mames, no jodas

Etymology 2

Phrase

1. (euphemistic) Synonym of no mames