Like the word "farther" which denotes a physical advancement of distance, "further" simply denotes advancement to a greater degree. Often confused with "farther" by those who weren't paying attantion in 8th grade grammar.
Synonyms for further
On this page, you will find 30 slang terms related to The further. Some of the top words include: In Spades, mo, superb, extreme, way, and 25 more.