samson, n. — Green’s Dictionary of Slang

samson n.

also sampson, samsin

[the biblical strongman Samson; ? either the strength of the drink or the strength it imparts to the drinker]

a drink combining brandy, cider, sugar and water.

1847–81		Halliwell Dict. Archaic and Provincial Words II 704/2: sampson. A drink made of brandy, cider, sugar, and a little water. Cornw[all].
1905		Bulletin (Sydney) 21 Dec. 17/3: Blacks live amongst and work for the heathens for a smoke of opium or a drink of ‘samsin.’ [...] ‘Samsin’ is sold at 2s. a bottle.
1933		‘William Juniper’ True Drunkard’s Delight 230: If you prefer to take your brandy in a balderdash you may have a Samson or Sampson.