Top Definition
A River Themes is a drink usually made at the end of the night where, those left standing/sober gather all the alcohol they can find that is left and mix it together, generally giving the final product a dark murky look, hence the name, river themes.

It generally tastes disgusting, but hopefully by this time of night you wont be feeling it.

There is almost certainly an extremely high alcohol content, and it should get you very drunk very quickly. If it does not, then you have made the drink incorrectly.
Last night, we were vagely sober and so mixed cider, beer, whisky, WKD and some rum to make a high-content River Themes. This always seems a good idea late at night.
by Ronii Devine September 04, 2010

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