Meaning – unnecessary items, everything including things which you do not need, almost everything
In Context – Pam’s always overweight when she travels. She packs her luggage with everything but the kitchen sink.
Idioms with a synonymous meaning – everything under the sun
QUOTES WITH ‘EVERYTHING BUT THE KITCHEN SINK’
Some couture collections have everything including the kitchen sink! Everything gets thrown on to make it look expensive. Alexander McQueen