Wet my whistle

To consume a beverage of some sort.
Technically it should only be used in reference to drinking beer because of the history of the phrase:
Back in the middle ages when beer was sold in ceramic cups they would be fitted with a small whistle which could be blown upon finishing ones beverage in order to alert the bar staff that you require another beer. Therefore to get a beer would literally be "wetting ones whistle"

Martin - oh look, I finished my lovely pint of ale. Best wet my whistle with another Broadside or London Pride.
Alexi - Get me some chillie nuts or prawn cocktail crisps while your there, you slag.

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