Gubba nub nub doo rah kah means 'Whatever lets you sleep at night' in Birdperson language.
From the 'Rick and Morty' show. In the episode Ricksy Business.
My people have another saying-- "gubba nub nub doo rah kah". It means, "whatever lets you sleep at night".
A dirty nub occurs when a male takes a female out into the woods on a four wheeler, lays her on her back over the handlebars, and uses the handlebars to achieve extremely powerful thrusts, causing great pleasure and bruising to the female.
“Bro, I took that cheerleader out to my place and gave her a dirty nub, and she couldn’t walk right for days!”