would something like this be considered slang but valid, or totally invalid:

ボブのばか

That isn't even slang. Everyone says it here.

To elaborate on what MMM said, you can remove the のほろこちゃん and it would still make sense. 友達の would not, however. 友達の一人 would, however.

heys thanks all for your replies.

anyway, what exactly is the difference between this 2 sentences

1) ならはきょうとよりゆうめいじゃありません

2) ならはきょうとほどゆうめいじゃありません

Meaning-wise, they are exactly the same. 2) makes the speaker sound considerably maturer.
_____

To be strict, the better speakers would rarely say じゃありません. じゃ is a colloquial word for では. By combining it with the not-so-casual ありません, you're creating an imbalance within a short phrase, which better speakers would do anything to avoid. It's one the phrases used more by Japanese-learners than by us Japanese-speakers. I recommend that you use ～～ではありません.

does using ほど makes なら sounds more famous then if i use より?
in other words if it is this case:
1. AさんはBさんよりへたですじょうずではありません
2. AさんはBさんほどへたですじょうずではありません
which should i use to "soften the blow" and not make A-san sounds too "lousy"



also regarding ほど is it true that the right side must be a negated expression so i can say ほどじょうずではありません but not ほどへたです right?

heys all i've got 2 questions regarding this sentence: にくもさかなもたべません

is the last も required, in other words can i say this: にくもさかなたべません

also can i add more terms like にくもさかなもやさいもたべません

1. You might hear people say #2, but #1 is better. #2 feels like it's missing a particle (because technically it is).

2. Yes.

Go with your instinct. We don't say #2.

Unlike は, が or を, も never gets omitted even in the sloppiest spoken Japanese. も doesn't get omitted because it has more "meaning".

thanks all for the answers =D as for the particle の, is it true that sometimes its optional. if so how do i decide whether its needed or not. will both of these be acceptable:
ワンさんというひとをしっていますか
ワンさんというのひとをしっていますか
and this 2:
ワンさんの日本語能力はじょうずですね
ワンさんの日本語の能力はじょうずですね

also does this sentence requires the の particle?
これはわたしからのプレゼント