(Internet, informal) An anonymous account (typically on a social media website) used (temporarily) for activities that the user does not want to have tied to his or her main account.

To kill (someone) by tying them to a post and setting a fire beneath them

A censer (vessel made for burning incense or perfume in some solid form).

A knot on a tree caused by root tissue growing in the trunk or a limb; a burl.

plural of burr knot