Yes, sometimes the meaning of crash out may be negative in some online or rap usage. Although it can be used to mean falling asleep, it can also refer to not thinking and not giving up or doing something risky that will result in failure. As an example, the statement He crashed out and lost everything can be interpreted as a wrong choice. The teens may acquire this slang in music or social media and therefore the parents must make sure they know the two meanings of this slang before they use it in casual conversations. Know more about crash out meaning