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Noun
An
unexplained
phenomenon
that
sounds
like
a
thunderclap
,
cannon
storm
earthquake
volcano
or
sonic boom
coming
from
the
sky
,
with
no
observable
cause
,
heard
in
various
countries
around
the
world
.
Made with ♥ by Homo Sapiens on Planet Earth

Rejected by Y-Combinator. Definitions by Wiktionary.

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