Sancho is the Mexican (Spanish) slang for the other man in a relationship
Explanation:
In other words, the man that a husband or boyfriend knows his wife is cheating with when said husband or boyfriend isn't around (the female equivalent is sancha)
The name Sancho is an Iberian name of Basque origin (Santxo, Santzo, Santso, Antzo, Sans).[1] Sancho stems from Latin Sanctius.[2] The feminine form is Sancha and the common patronymic is Sánchez.
