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1.
Alternative slang to masturbating.
"I'm brushing it hard, bitch, swallow."

"Damn, I need to brush on that broad."

"Alright guys, I'm gonna brush and head to bed"

"Keep it to yourself man"
by Bubba TheLoveSponge February 13, 2008
 
2.
The act of rubbing one's pubes onto another individual, using a forward and back technique.
Me and Jessica were grindin' and brushing all night yesterday! Now my genitals are itchy as fuck
by Subi Billy Juice Mo Guilo December 05, 2011