subs. (old).Beer, egg, and brandy made hot.
1785. GROSE, A Classical Dictionary of the Vulgar Tongue, s.v.
1834. W. H. AINSWORTH, Rookwood, iii., 5. If thats a bowl of HUCKLE-MY-BUTT you are brewing, Sir William, added he, addressing the knight of Malta, you may send me a jorum at your convenience.