To waste time; spend time idly.
To do nothing, to be idle.
To headbutt (from loaf of bread)
To be in catloaf position (for cats or other animals)
A block of bread after baking.
Any solid block of food, such as meat or sugar.
A solid block of soap, from which standard bar soap is cut.
Shortened from "loaf of bread", the brain or the head (mainly in the phrase use one's loaf).