Mr. Boing Boing

Mark Dery says, "The alt.sex.stories web archive has a page devoted to Japanese sexual slang. I especially like this one:"

Erection Pin. This is a playful term. "Binbin-daze" is an affectionate name meaning "Mr. Boing Boing" in reference to a young man's penis that is always on the verge of erection.

Link (via DazeReader)