Used casually among friends, not in formal settings like job interviews or official documents. I ran into Ellie at the store, and she looked like something the cat dragged in.
Pro Tip 2/3
Negative Connotation
Suggests a negative impression, so be cautious when using it to avoid offending someone. Don't take this the wrong way, but you look like something the cat brought in.
Pro Tip 3/3
Visual Impact
Reflects a strong visual image of untidiness or illness, making it a vivid expression. Mike showed up at the party looking like something the cat dragged in.