boing

Interjection

1. A representation of the sound of something bouncing.
   • "Phut." Something whipped into the ground beside him and there was a pinpoint flash from the cabin. "B-o-i-n-g-g-g." There was another flash and the bullet hit the rail and whined off into the night.1956, Ian Fleming, Diamonds are Forever, published 1965, page 100
   1. (slang) Announcing the presence of large, pert breasts, which are bouncy.
   2. (slang) Announcing the advent of male arousal (erection), via the metaphor of a spring springing energetically.

Noun

boing (plural boings)

1. The sound made by an elastic object (such as a spring) when bouncing; the sound of a bounce.
2. (slang) Large breasts.

Verb

boing (third-person singular simple present boings, present participle boinging, simple past and past participle boinged)

1. (transitive) To make a boing sound or bouncing motion.
   • At its most extreme it is reminiscent of the boinging and buzzing of a Jew's harp.1988 October 7, Peter Friederici, “Auction”, in Chicago Reader