look up any word, like cunt:
 
3.
Signature features.
The eighties single "One slip" has all the requisite bells and whistles of a classic Pink floyd tune.

President Obama's speech held all the bells and whistles of that of a true statesman.
by Kjell72 March 03, 2011
 
1.
Features or extras to make something more unique and flavorful without necessarily adding to the utility of the primary function.
Look at all those gauges! These new Pontiacs come with ALL the bells and whistles!
Windows ME is the fuckin same as Windows 98, but with some stupid bells and whistles.
by MustangGT September 29, 2005
 
2.
features that add to the appearance of something but do not make it function any better
If you want bells and whistles you should go to the other aisle.
by The Return of Light Joker November 06, 2009