Here's a breakdown:
* Limp dishrag: A dishrag is a cloth used for cleaning, and when it's limp, it's completely wet and floppy, lacking any structure or ability to hold its shape.
* Metaphor: This phrase compares the speaker's feeling to the physical state of a limp dishrag.
* Meaning: The speaker is conveying a feeling of being utterly drained, like they have no energy or willpower left. They are completely lacking in enthusiasm or motivation, similar to how a limp dishrag is unable to perform its function.
In other words, the speaker feels completely spent and depleted, both physically and emotionally.