Quick phrase translation.

Hello. I'm trying to translate.

"If you only fucking knew," into Spanish.

My Spanish is incredibly rusty but I concluded it'd be something like
"SI SABÍAS SOLAMENTE (If you only knew)". I could be wrong though. Correct me, of course.

though. In class they, obviously, don't teach you slang and broken Spanish (Which I'm more interested in). so. I'm a bit baffled how I would implement use the word "fucking" in that context as an ADVERB (If it is ever used in Spanish in that context) and, of course, what the word actually is. pinche? joder?

I don't know much about adverbs and such.

Any help will be appreciated. Thanks~.

Yo ya me voy!

¿a quién va dirigido?

Traducción de una canción.

Tú form, obviously. Other than that, I'm not sure what you're asking. Hahaha.

it could be: "chingado, si sólo supieras"...
(I forgot you don`t speak spanish)

I thought of that but "chingado" is the noun, no? I'm not calling someone that, or at least, that's not what I'm intending. The use as fucking as an emphasis, an adverb. such as. "If you only fucking knew. I'll fucking show them. What a fucking deal. etc." Correct me if I'm wrong, though.

putiando? If that's the adverb, I wouldn't know where to implement it in "si sólo supieras".

Fucking Means "puto" O "jodido". I.e. "give Me The Fucking Book" Translates, "dame El Puto/jodido Libro". However, In This
In This Case, I Would Translate It As:

"carajo, Si Solo Supieras". You Could Also Use Other Expressions, Such As : "joder (in Spain), Si Solo Supieras" Or "maldita Sea, Si Solo Supieras" Or "coño, Si Solo Supieras".

you could also translate
Carajo, si solo supieras
Coño, si solo supieras
Diablos, si solo supieras

some other expressions can be less formal, it all depends on the "final destination" of the translation. If it's just for you, then you can use other expressions already mentioned by josie73

Also, the curse depends on the country. In Argentina it would be:
la puta madre, si supieras

I agree with In-house. In Argentina, people are more passionate when it comes to cursing...:D

Hehehe. Thanks everyone! My old Spanish teacher was awful and didn't really go over verb conjugation (Which is always the biggest pain for me in constructing a sentence).

Could anyone else help me with "I'll fucking show them" (a quote from a book).

"Yo les jodido enseñare"
Is my guess. (I believe I'd use enseñar for this context, not sure if it is in the right form though).

Hehehe. Thanks everyone! My old Spanish teacher was awful and didn't really go over Spanish conjugation much. I'm also trying to translate "I'll fucking show them" (A quote from a book).

"Yo les jodido enseñarse" was my guess.

(I believe "enseñar" would be proper in this context though I'm not exactly sure if it is in the right tense. gah! I need to teach myself Spanish again, ha ha).

For anyone who's wondering, I'd like the more Mexican slang. I'm not really familiar with the other countries and people.

I'll fucking show them!
either
Yo les voy a enseñar
or
Ellos van a aprender
and the four letter word first. Of course, if you like Mexican slang
La puta madre que les voy a enseñar!
or
La puta madre que van a aprender!!!;)

Thanks! :)

I was wondering, if it's possible, if I could use the word "chingar" and still mean the same thing. Chingaos, chingado, etc.

Thanks again!

you could use the word but it depends on the position of the sentence and how you use it.
"chingaos, les voy a enseñar" could do

The correct verb tense and conjugation is "Les Voy a Enseñar" or even "les voy a demostrar".

and then you can add any of the options you were given for the word I omitted (jeje) :)