In real life, real people often curse and use offensive phrases, and
if klingon is to be used as a real language, it needs to be used that
way too. If this is a problem for you, then perhaps you should move to
a planet where people do nothing else, than wear klingon t-shirts and
sing all day "may gowron lead the empire".

qaStaHvIS yInna', mu'qaDmey bach nuvpu', 'ej Qutbogh mu'tlheghmey lo'.
Holna' oHchugh tlhIngan Hol'e', vaj wanI'vam chIwnIS je. thlIHvaD
qay'chugh, vaj lalth yuQ yIDabchoH. pa', tlhIngan wepmey tuQtaH
nuvpu', 'ej bomtaH: wo' DevtaHjaj ghawran.