1. What does it mean?
패알못 combines 패션 with 알지 못하다, not to know. It usually labels someone with little knowledge of clothing trends or outfit coordination. The 알못 pattern also appears with games and other subjects.
Also written or said as paealmot
2. The nuance
It is often self-deprecating. Calling another person 패알못 can sound dismissive, and disliking a trend is not the same as failing to understand fashion.
3. Examples
“패알못이라 기본 색부터 맞춰 입어 보려고.”
I'm clueless about fashion, so I'm starting by coordinating basic colors.
“친구는 패알못이라더니 신발 고르는 감각이 좋더라.”
My friend claimed to know nothing about fashion, but they had a good eye for shoes.
Sources
References support the meaning and usage. Example sentences are written for NoCapWiki.