This phrase is not exactly a slang, but a colloquial saying used in Spain. It's used to express that two people are going in different directions in life: one is improving and the other is deteriorating. 'Tú para más' means 'you for more', indicating progress, and 'yo para menos' means 'me for less', indicating regression.
Examples
- Spanish: 'Amigo mío que nos perdemos, tú para más y yo para menos', le dijo Juan a su amigo después de que él le contara sobre su nuevo ascenso y Juan le contara sobre sus problemas de trabajo.
- English: 'My friend, we are getting lost, you for more and I for less', Juan told his friend after he told him about his new promotion and Juan told him about his work problems.