U 4.486: Or hanging up on the floor.
Reentering the house after a visit to the pork butcher's Bloom is distracted by Boylan's letter to his wife and forgets where he has left his hat: "Must have put it back on the peg. Or hanging up on the floor."
This humorous way of referring to things left or piled on the floor was a popular idiom in Bloom’s day:
I found fur cap and cloak hanging up on the floor in the cloakroom.
(Milwaukee, Wisconsin) (1873), 29 June, p. 29
I'm open to admit I laughed the heel of my boot clean through the brim of my own chaste 'topper', which was hung up on the floor under my seat.
up (1890), vol. 2, p. 118
By an effort I controlled myself, and began to take my coat and hat and veil and things off. As I could see no pegs anywhere I hung them up on the floor.
(1911), p. 81