Green’s Dictionary of Slang

a drunkard.

[1636		W. Cartwright Royal Slave I i: In the praise of their great huge, rowling, Tunbellyed god Bacchus].
[1661		‘The Encounter’ Rump Poems and Songs (1662) I 329: Will, when thou dost slack us, / By warrant from Bacchus, Wee’l Cane thy Tun-belly’d Master].
1890–1904		Farmer & Henley Sl. and Its Analogues.