In your tag, you use pipe character (|) in the new line and indent it to add plain text in multiple lines.

p
  | This is
  | piped text.
  |	This is another
  |	piped text

 // Result: This is piped text. This is another piped text

Pug adds a space after every piped text without adding manually. But if you add an inline text after your tag, you need to add the space manually

p This is an inline text without space.
  | This is
  | piped text.
  |	This is another
  |	piped text
p This is an inline text with space.
  | This is
  | piped text.
  |	This is another
  |	piped text

// Result
// This is an inline text without space.This is piped text. This is another piped text
// This is an inline text with space. This is piped text. This is another piped text