Nutes is a common slang term for plant nutrients. Nitrogen, phosphate and potassium (NPK) or any of the micro nuttrients, sulphur, calcium, magneseum and iron, etc..
A synonym for the slang "nuts" referring to the testicles of the male anatomy. It is usually used in insults typed by young boys patrollingthe internet.
$up4d34th={lolz}=: how did u killme hacker $up4d34th={lolz}=: i'l hackur computergive me ur email
$up4d34th={lolz}=: u guy suck nutes
It means "nutrients", guys . . . . I can't imagine where all these silly definitions come from, but it originated in the health & exercise community: macro and micro nutes are essential to any workout program. It has since moved to being used in hydroponics, in which only the minerals fed to the plant are called "nutes". Same concept.
Make sure to focus on your micronutes, not just your macros, if you want to be an athlete.
If you want to grow the fattest green (or red, purple, yellow..) then give your plant all the nutes it needs.