old bugger
An old man called Brian who has a slight bald patch on top of his already balding head that is roughly 30-35 years older than Jesus if he was still alive today.
How old is Brian again?? He's an old bugger.
silly old bugger
Silly Old Bugger or Silly Ol' Bugger is generally a term of endearment. While sounding like an insult and bugger being a swear word it is mostly intended as an affectionate response to a mate or friend.
Friend 1. "Oh man, I just spilt my beer, again."
Friend 2. "You silly old bugger, let me get you another."
Friend 2. "You silly old bugger, let me get you another."