A quick exclamation used when something extraordinary, sudden or explosive happens.

–interjection
1.
(an exclamation of surprise, shock, wonder, pleasure, or the like): Beklang! Look at that!

–verb (used with object)
2.
to gain an enthusiastic response from; thrill, or shock.

–noun
3.
an extraordinary success: His show is a real Beklang!

4.
excitement, interest, great pleasure, or the like: Those eyelashes will add some Beklang! to your life.

Origin:

2010; perhaps during the making of headphone-based theatre piece, 'Our Broken Voice' (a Subtlemob) - when the pivotal event in the piece was left undefined... so the creators decided to Beklang! the s**t out of it.