Beer mixed with a soft drink, such as carbonated lemonade, ginger beer, ginger ale, or apple juice or orange juice. The proportions of the two ingredients are adjusted to taste, usually half-and-half.
“Me and Swinyard were playin’ Asteroids at the Black Swan yesterday evenin’, right. Wilcox comes in, actin’ like King Hard Knock, sayin’ nothin’, then he goes and drops his fag in my shandy.
Definition from Wikipedia