Rich Ahrens wrote in
ouse.com:

Bertie the Bunyip wrote:
His example... "********ed it up", you already know. but he could
have also said " I made a ******** of it" and it's likely he
exclaimed "********" as his wing touched the runway. Pretty much just
**** or **** in US english.
If someone were to tell you something of which you doubt the veracity
you might say to him "that's ********" in fact it's pretty much a
direct substitute for bull**** or horse ****.
Yet another use is "He's a ********" which is pretty much a straight
swap (or swop of one prefers) for ******* or similar.
You can also give or recieve a bollocking. This roughly translates
into getting a new one torn. Past tense, bollocked.
You can also be ********ed, which means you are very tired. This is
not so common as it more common to say "I'm knackered" which means
wrecked, but ********ed can also be used in more extreme cases of
knackeredness. Can also mean getting drunk in some circles, though
that's usually getting ****ed as I'm sure you know.
And last but not least when some ******** makes a ******** of
something the best think to do is to kick him square in the ********.

Also spelled Bollox and Bollix. If there;s a difference between the
three I'm not aware of it.

I think that's fairly accurate, though it's more than likely some
******** will come along and correct me.

Never mind the ********, here's the bunyip!

Xachery!

And one more, "He thinks he's the ********" Which is the commonly
shortened version of "thinks he's the dog's bolocks" , the dog's
******** being a superlative.
A good car can be the dog's ********, for instance.

Such a subtle and wonderful culture.

Bertie