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1.
1 - The inner lining of the smooth thin layer of skin inside the anus.

2 - The anus of any mammal.
MY OH MY that dick went up my squiffer like a finger through warm butter.
by Erectism October 21, 2007
 
2.
Squiffer - A happy young child. A child who is grumpy is said not to be feeling very Squiffy
Parent - "Morning Squiffer ! How Squiffy are you feeling today"

Child - "Quite Squiffy thankyou..."
by Ian Murray June 19, 2008
 
3.
that which makes one squiffy or slightly intoxicated
Dude, pass the squiffer - and the Doritos.
by zldj November 17, 2006