The one and only soulja boy's penis being erect.
It's ofen spotted when he takes "sexy" cell phone pictures.
soulja boys boner. go look. its on his myspace.

example:

"Hey Souja Boy I see your souljaboyner through dem boxer."
or

"OHHHH SHITTT... Soulja Boy got nominated for the Nickelodeon Kids Choice Awards, I bet hes got a souljaboyner."
by amberisrad April 28, 2008
Get a souljaboyner mug for your brother-in-law Jerry.