
fixen
to shoot up
In the drug scene, the colloquial term for injecting hard drugs intravenously, especially heroin.
Er hat in seiner Jugend eine Zeit lang gefixt.
For a while in his youth, he used to shoot up.
to fix / to shoot up / to hook
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to shoot up
In the drug scene, the colloquial term for injecting hard drugs intravenously, especially heroin.
Er hat in seiner Jugend eine Zeit lang gefixt.
For a while in his youth, he used to shoot up.

to fix
Colloquial for quickly repairing, arranging, or sorting something out. The term is borrowed from the English 'to fix'.
Kannst du mal schnell den Drucker fixen? Er funktioniert nicht.
Can you quickly fix the printer? It isn't working.

to hook
Colloquially, to get someone excited about something or make someone dependent on something.
Die neue Serie hat mich total gefixt, ich kann nicht aufhören zu schauen.
The new series totally hooked me; I can't stop watching.
The meaning of 'fixen' depends extremely strongly on context. Pay close attention to the situation and the other words in the sentence in order to understand it correctly.
Er muss das Problem schnell fixen.
He has to fix the problem quickly.
The meaning 'Drogen spritzen' (to inject drugs) belongs to the colloquial language of the drug scene. In this context, the verb is often used without an object and has very negative connotations.
In dem Film wird gezeigt, wie die Hauptfigur anfängt zu fixen.
The film shows how the main character starts shooting up.
In the meaning 'reparieren' (to repair), 'fixen' is a colloquial loanword from English ('to fix'). It is always used with an accusative object that is being repaired.
Ich muss kurz mein Fahrrad fixen, bevor wir losfahren können.
I have to quickly fix my bike before we can leave.
When 'fixen' means that someone is excited about something, the structure is 'Etwas fixt jemanden' (something hooks someone). The subject is the thing, e.g. a series or a game, that triggers the excitement.
Dieses neue Videospiel hat meine Freunde komplett gefixt.
This new video game completely hooked my friends.
to inspire / enthuse
Begeistern and fixen can both express that a series arouses strong interest. Begeistern refers to ordinary enjoyment or enthusiasm, while the colloquial fixen additionally suggests very strong, almost addictive persistence. Use begeistern generally, and fixen only for this marked, informal nuance.

Die neue Serie fixte ihn so sehr, dass er unbedingt sofort die nächste Folge sehen wollte.
The new series hooked him so much that he absolutely had to watch the next episode immediately.
Die neue Serie begeisterte ihn, sodass er jeden Abend eine Folge ansehen wollte.
The new series delighted him, so he wanted to watch an episode every evening.