It is also used when greeting or leaving a Superior in a KJJ dojo. It serves as a sign of respect and conveys one's intentions to give all that they have (in effort and attention).
Further emphasis can also be given with an additional syllable. "Ouss-Ahhh". Not to be mistake for the softer and gentler "Oo-sah" done in meditation.
(While delivering a strike) ""Ousss"
(As a greeting or goodbye) "Ouss"
the term was contrived by an ambidexterous, malicious aggregation who have a profession in improvisation.
quite a marvolous load of shit !!!!