Is it appropriate to use bad language (ie. curse words) in your adverts if they're going to make your advert extremely funny?

I sort of agree with Mr. Aqeel Khan. Like, 'never let them see you sweat.' So, swearing and mockups in an office may involve hilarity, though ads are intended to reach the public. Target demographics might include stragglers like kids at the hip learning how to read. War crimes include broad scale attacks with widespread miscalculations and citizen loss for minimal targets. Only a discrete subset usually finds banal humor in commercial ads amusing.

that is totally unporofessional question 

I don't think it's appropriate to use curse words in an ad, even if the intent is to provide humor. Some ads can indirectly give a certain inappropriate message but not fly out write the curd words. Also from an ethical and professional stand point, advertisers should refrain from there use of improper lingo.

I am sure doing this will be against advertisement policies. I'd be surprised to see if some company or country allows using abusive language.

only if its for a specific costumers.