ขี้ (kêe) has 2 meanings.

The first meaning is poop 💩. I will explain the second meaning more in-depth.

The second meaning of ขี้ (kêe) can’t be translated directly to English. ขี้ is a prefix for adjectives that is used when negatively describing someone’s characteristics. Meaning the person is constantly being that way.
The pattern looks like this: ขี้(+ lazy), ขี้ (+ stingy), ขี้ (+ envious), etc.

Some examples should clear this up.

Being bad-tempered is a negative trait, so If a person is always bad-tempered you would call them ขี้โกรธ (kêe-gròht). โกรธ by itself means angry so if you want to describe someone as always being bad-tempered you say they are ขี้โกรธ.

• Forgetful: ขี้ลืม kêe leum
  
  
• Jealous: ขี้หึง kêe hĕung
  
  
• Loser: ขี้แพ้ kêe páe
  
  
• Stingy: ขี้เหนียว kêe nĭeow
  
  
• Lazy: ขี้เกียจ kêe gìat

I hope you now know the meanings of ขี้ (kêe) and know how to correctly use it to describe someone.