In Spanish slang, a term for a man's secret or second romantic partner, or sometimes used as a casual term for a companion or friend.
From Spanish personal name Sancho, popularized through literature like Don Quixote (where Sancho Panza is the loyal squire), with the slang meaning developing through cultural usage in Latin American communities.
The word gained modern slang usage in hip-hop and Latino communities to describe someone who is 'on the side,' making it a perfect example of how literary characters can influence everyday speech in unexpected ways.
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