Exclamation: onomatopoeia used to describe the perceived auditory indication of a rapid erection. Analogous to "Schwing", as defined and popularized in the movie, "Wayne's World". Bjong!!
n. bjonger: erection.
"Damn! That girl was a ten! Bjong!"
"Cindy, that guy was looking at me. I think I could hear a Bjong!"