Another name for a skilled surfer, used mainly on the Pacific Northwest coast. Someone who likes to surf a lot. An avid surfer.
"Hey man, you see that salty brain out there? He's shredding that 15 footer"

"Josh is a serious salty brain, he catches huge sets everyday"
"You gotta be one salty brain to try Mavericks"
by Spartacus on the coast December 15, 2016
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When your getting a blowjob and when your about to cum you pull your dick out of her mouth and fire a load straight up her nose.
You dude I was getting a blowjob so I pulled out and gave her a salty brain.
by Big Tessy May 22, 2008
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