Energy, high spirits.
"The hospital staff is administering PEp to prevent HIV infection after a needle stick injury."
Initialism of post-exposure prophylaxis.
In plain English: Pep is energy and enthusiasm that makes you feel excited to do something.
"The coach gave us some pep before the big game to boost our morale."
To inject with energy and enthusiasm.
"The coach gave the team a pep talk before the big game to boost their spirits."
In plain English: To pep someone up means to make them feel more energetic and enthusiastic about something they are doing.
"The coach tried to pep up his tired team before the final game."
Initialism of Python Enhancement Proposal.
"The developer submitted their pep to suggest a new feature for the language."
Pep is an abbreviation derived from the word pepper, which originally referred to a spicy seasoning. The term was shortened and adopted into English to describe energy or liveliness rather than just its literal culinary meaning.