der Pep
pep
Colloquial for momentum, drive, or energy that makes something livelier or more interesting.
Dem ganzen Projekt fehlt noch der nötige Pep.
The whole project still lacks the necessary pep.

pep / speed
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pep
Colloquial for momentum, drive, or energy that makes something livelier or more interesting.
Dem ganzen Projekt fehlt noch der nötige Pep.
The whole project still lacks the necessary pep.

'Pep' is a loanword from English, where 'pep' also means drive and energy. The pronunciation is based on English.
Mit etwas Musik bringen wir mehr Pep in die Veranstaltung.
With a bit of music, we'll bring more pep to the event.
The word 'Pep' is used exclusively in colloquial language in both meanings. It is uncommon in formal or written contexts.
Die Präsentation war gut, aber ihr fehlte der Pep.
The presentation was good, but it lacked pep.
You can clearly tell which meaning is intended from the context. If it is about projects, food, or fashion, it means energy. If people are talking about drugs or crime, it means the drug.
Der Soße fehlt noch etwas Pep, vielleicht ein paar Kräuter?
The sauce still needs a little pep, maybe a few herbs?
In the meaning of 'Schwung' (drive), 'Pep' is often used in fixed phrases: something has 'Pep' (pep), something 'gibt Pep' (adds pep), or something is 'ohne Pep' (without pep).
Ein bunter Schal gibt deinem Outfit den richtigen Pep.
A colorful scarf gives your outfit the right pep.
energy
'die Energie' and 'der Pep' can both express momentum or liveliness. 'Energie' refers more to a person's strength to do something and keep going. 'Pep' is colloquial and often describes something seeming livelier, more interesting, or fresher. You can say that a person has energy, but that a text, a talk, or an outfit has 'Pep'. The words can be confused because both sound positive and active. As a simple guide: 'Energie' is strength for action; 'Pep' is extra momentum or liveliness.

Ein paar Bilder geben der Präsentation mehr Pep.
A few pictures give the presentation more pep.
Die Lehrerin hat noch genug Energie, obwohl der Kurs lange dauert.
The teacher still has enough energy, even though the course lasts a long time.