The greatest non-swearing British insults:
And the list goes on.
I'm fond of the terms rotter and wanker, the latter of which I believe is considered to be quite vulgar, lol.
The first I have heard, refers to someone in the advanced stages of syphilis, when the body beings to decay. So it is quite rude, though I do not know how true the story is.
@Fernapple Hhmm, interesting. If whenever I use that word, these are the definitions I had in mind.-
[merriam-webster.com]
Guess that word has different meaning(s) in the UK and the US.
@SpikeTalon No I think it has the same meaning here, it is just that that is held to be the origin of it.