Dirty and Dirty!

I got a funny look the other day when I said (in Swedish) "they were a bunch of dirty old bastards". 

My friend said "uh...do you mean they were covered in dirt? I think you mean something else". 

I then asked her for the correct word, which rhymes with the word I mistakenly used!

Smutsig means dirty as in "They were covered in dirt". 

Snuskig means dirty as in "He was a dirty old git!".

Swedish, that ain't fair! It's like you're trying to confuse me! ;-)