Air Biscuit

Also found in: Idioms.
A slang term for stool that floats
References in periodicals archive ?
Okay, not really - but there are more beefs, butt trumpets, air biscuits and bottom bups than ever before
The Chris Wall-trained Air Biscuit followed up her recent Brighton victory in the opening apprentice handicap in the hands of Jonjo Milczarek.
In many people's eyes the natural successor to Sadler's Wells followed up his clean sweep in the St Leger with another winner courtesy of Air Biscuit - albeit at a considerably lower level