HONESTLY, I was REALLY going to post about that very line today. I was going to list the funny things that you hear if you listen, can only remember one now: "If we can't get that shield repaired, we'll be sitting ducks" I'd love to see the ducks of Star Wars, reckon they'd look like ducks, or would they be huge, malformed, carnivorous beasts? QUUUAAACCCKKKK!!! 😠
It's the infrequent inclusion of lines like "you look strong enough to pull the ears off a Gundark" that add the best comic value. If the films were littered with lines which make no sense to us, they wouldn't be as entertaining to watch. Besides, how many viewings did it take people to notice the use of the word 'Hell'? As for swearing, I'm sure that "E Chuta!" is the closest we'll get, although when we first got introduced to Yoda, I just KNEW that R2 was mumbling some obsenities.
If they wanted to be really anally retentive, they could have had the whole dialogue in a different language because English didn't exist, but one has to draw the line between unbelievably like Earth:now and stupidly and unenjoyably alien. They allowed for English dialogue, with the odd Earth phrase thrown in to relate to the audience. It couldn't have worked better if you ask me.