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the fusion of these two popular uses of "brain":

1) blowjob; head; dome; oral sex
2) the brain-like appearance of a scrotum when pulled through a pant zipper to show to unsuspecting bystanders

coupled with a unique pronunciation of "brain" which incorporates dramatically oscillating vocals has yielded the following definition:

n. oral sex performed on the scrotum; gargling a nutsack; sucking on some balls
"holy shit dude! leslie gave me some steamy brayayain on her front lawn after homecoming!"
by biglrock October 20, 2009

Words related to brayayain

brain dome head scrotum ballsack blowjob nuts oral sex