To address the part of this question which is on topic for this stack:
'passfuckingport'... Is it a wrong use of an interjection or word combination?
This is (pretty much) correct usage of -fucking-, although not the most euphonious of examples.
This is not a trivial question at all and, as the language is informal and offensive in many contexts, and because the rule is somewhat complex, it is unlikely to be covered in English language textbooks; it would hinder rather than help most ESL students.
Steven Pinker gives it treatment in The Language Instinct, giving the example of Phila-fucking-delphia.
Not having access to the book at present, I found the following article referring to the same topic in Philadelphia magazine. The article refers to the writing of two other linguists, both Philadelphians at least by academic association (who are very probably exactly who Steven Pinker refers to as well, although, as I said, I don't have the book to hand to check).
[Anne Pomerantz, senior lecturer of educational linguistics at the University of Pennsylvania’s Graduate School of Education] pointed out that “Phila-“ and “–adelphia” are both derivational morphemes — word parts imbued with meaning that can be added to other morphemes easily to create new words, called blends, like Geekadelphia (a brotherhood of geeks)...
[Rolf Noyer, Professor of Linguistics at the University of Pennsylvania] wrote that “Phila-“ and “–adelphia” are both accented syllables, giving Philadelphia a “metrical structure” — something most other city names don’t have.
“When forming blends, speakers usually respect the metrical division, and the fact that the word is long enough to have two metrical parts (aka “feet”) means that substituting something new for one of the feet is possible,” wrote Noyer. “In a short name, such as Boston, there is only one foot, so it’s not possible to switch out one foot for something else.”
Noyer suggested a fantastic technique for finding the foot division of Philadelphia or any other word for that matter: “Expletive Insertion.”
“All speakers of English know (unconsciously) that if one is going to insert an expletive — standard example in the U.S. is fuckin’, in the UK bloody, but friggin’ and goddamn work just as well — into a word or phrase, one has to do it at the foot boundary, where the expletive is itself a whole foot.
“So while (Phila)(fuckin)(delphia) is a fairly unremarkable, if vulgar, utterance, no speaker would ever think of saying Phi-fuckin-ladelphia, Philadel-fucking-ia, or Philadelphi-fuckin-a, which are logically possible,” writes Noyer.
(All emphasis in the quote is mine.)
Passport, similarly to Philadelphia, is a word of two halves, and you've put -fucking- in the right place... that is, if you're going to put it anywhere: this -fucking- formation works much better with longer words, such as abso-fucking-lutely, where there are at least two stresses and enough unstressed syllables that they have some kind of meter.
While it's the foot division - the meter - that is determinative here, it probably helps pass-fucking-port's case inasmuch as you've hit on a boundary between two meaningful parts of a word - pass and port.
Having said all that, passport only has two syllables, so there isn't much in the way of choice when it comes to possible locations for expletive infixation, the standard term for this, rather than the expletive insertion which the article quoted used.
I do think Pinker et al. overstate the case and there is much more regional variation in how -fucking-, -bloody- and other expletive infixes are employed than they seem to allow for, and while it may lack the poetic bounce of Phila-fucking-delphia, pass-fucking-port is kosher enough.