This phrase is not exactly a slang, but rather a proverb. It translates to 'He who plays out of necessity loses by obligation'. It is used to express that when one is forced to do something (especially risky things like gambling), they are more likely to fail or suffer the consequences because the pressure or desperation can lead to poor decisions.
Examples
- Spanish: Carlos siempre apuesta todo su dinero en el casino. Ya sabes lo que dicen, 'el que juega por necesidad pierde por obligación'.
- English: Carlos always bets all his money at the casino. You know what they say, 'he who plays out of necessity loses by obligation'.