From the OED:
spider, n. 4. Austr. slang. A drink consisting of lemonade and brandy or similar ingredients, mixed; a soft drink with ice-cream floating in it.

From the quotations following:

1859 K. CORNWALLIS New World I. 300 Shandy-gaff, or spiders -- the latter to clear their throats of flies as they said.

In reply to Re: Re: Re: I refer to a non-specified carbonated beverage as a: by benizi
in thread I refer to a non-specified carbonated beverage as a: by Petruchio

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