Answer:

THELASTWORD

Answer	Crossword Clue
THELASTWORD	Ultimate authority.
THELASTWORD	Latest style: Slang.
THELASTWORD	Reigning fad

THELASTWORD	Latest, most modern thing
THELASTWORD	End of the quip
THELASTWORD	End of the truism
THELASTWORD	End of a solver's thought
THELASTWORD	Final remark in an argument

Crossword

a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.