The "and following" sense is short for "folios following" (though if read aloud, it should be read as "and following"). The "folios" that follow can be pages, paragraphs, Bible verses, or other sections of written material.
- "and following" (pages, etc)
When pronounced as the plural of 'f', it sounds like the Dutch word effen.
This abbreviation is primarily used in informal communication, such as text messaging and web messaging.