1. Unsatisfactory or lacking quality: This is the most common usage. It can be used to describe anything from food to a performance to a joke.
* Example: "That movie was weak, I was bored the whole time."
2. Not good at something: This is often used to describe someone who is not skilled at a particular task or activity.
* Example: "He's weak at math, he always struggles in the class."
3. Unconvincing or insincere: This meaning is often used to describe someone who is trying to be persuasive but is not believable.
* Example: "His excuse was so weak, I knew he was lying."
4. Not physically strong: This usage is less common in slang, but it can still be used to describe someone who is physically frail or weak.
* Example: "He's been feeling weak all week, maybe he's coming down with something."
5. Mentally or emotionally fragile: This meaning implies a lack of resilience or ability to cope with stress.
* Example: "She's really weak after the breakup, she needs time to heal."
It's important to note that "weak" can be a very subjective term. What one person considers weak, another might find perfectly acceptable.
The specific meaning of "weak" in slang will depend on the context and the speaker's intent.