Green’s Dictionary of Slang

jollux n.

also jollocks
[SE jolly, but note dial. jollus, fat, fleshy, jollock, jolly, hearty]

a fat person.

Show quotations
W. Mason ‘Ode to Sir Fl. Norton’ in Poems (1810) 419/1: And find it the same easy thing / To hit a Jollux or a king. (Note, A phrase used by the bon ton for a fat person.).
[Aus]Examiner 2 Dec. 5/2: [He] looks forward with a hopeful vivacity to the time when he shall be a fine grey-headed old jollocks of sixty-five.