Strange folder in my home folder after a failed run of BleachBit

Short answer: do

rm -r 4F8ZBREShQ

and go for a walk or get yourself a coffee.

Long answer:

Seems a bug of BleachBit. See http://bleachbit.sourceforge.net/forum/unremovable-folder-after-trying-wipe-free-space; you can join the discussion there.

The OP of Not able to delete folder from gui or terminal has been able to get rid of it, see the answer; but probably his method is overkill.

In effect, doing a rm -r 4F8ZBREShQ and being patient (really really patient; ext4 is not a speed monster for large directories, and this is LARGE) would work.

Recent ext4 should use a linear time with the size of the directory for the deletion process; even then, deleting millions of files will require a considerable time --- from tens of minutes to several hours.