It can also have other meanings depending on the context:
* "Weak" (physically or mentally): "Estoy flojo de la garganta" (I have a sore throat and feel weak).
* "Loose" (clothing, etc.): "El pantalón está flojo" (The pants are loose).
* "Lazy" or "unmotivated": "No hagas el flojo" (Don't be lazy).
The specific meaning of "flojo" will depend on the context of the sentence.