Lot of niggas' salty cause
Cause I be overseas and tough

from Lupe Fiasco – Say Something Lyrics on Rap Genius

Meaning

Salty is a slang term for having a negative attitude about someone else’s positivity. It’s a reference to having a sour expression on one’s face

The gist of the line is that people are sour about Lupe’s success and how it has afforded him the ability to travel the world, so when they are mad that he is “Overseas” he responds “Tough” (too bad)

BONUS CONTENT: The way Cool Young Lu raps the words he combines “overseas and” to say “over-seasoned tough,” which continues with his Salty/Apple/Fried Chicken thing he’s got going on. I’m hungry!

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