... is an expression which means: I'm feeling a little sick today.
The color gray is normally spelled with the letter 'a' in U.S. English,
but the colour grey is normally spelled with the letter 'e' in British English.
This blog is mainly to explain a different English language expression every day. Sometimes I post other stuff. I also have a YouTube channel which is mostly about computer software: https://www.youtube.com/englishspacedog