a word that is associated with OCD, it usually means something that is displeasing to the person in any way: physically, mentally and emotionally.
1. Z: bro that abit just spit in my eye when we were talking
T: WEEE! MESSAH!
2. That girl has had sex with 4 guys, its a messah for me bro.
3. Z, i had to take the killer messah shower today...the messah handwash isnt working