donut hole
noun
RareNot in standard dictionaries
1
The empty space in the center of a donut.
2
A small ball-shaped pastry, made in the same manner as a donut, roughly the size of the hole in a donut.
3
An income bracket where one is without benefits, even though benefits are available in the next lower and next higher brackets.
4
A section of water for which no one has fishing rights that is completely surrounded by regions where various parties hold fishing rights.
5
The anus.
#slang