A person that is born a hermaphrodite and chooses the male sex due to the inability to grow breasts. Given a name that is interchangeable between the male and female sexes in order to allow for a gender decision. After a choosing a gender, this person tends to sexually attract members of both sexes.

"He's so girly, I wonder if he's gay."
"No, he's not gay, he's a rosenberg."
by Rory Pad September 03, 2006
When somebody successfully urinates on a males ballsack.
Myles: "Pissing on ballsack"
Taylor: NOOO! Nigga gave me a rosenberg!
by Shuckle July 08, 2009

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