Straight up usually means the same as "neat", but its usage can cause confusion, as American mixologist Jeffrey Morgenthaler has explained, because there's also the term up , which usually means chilled and served in a cocktail glass.

BBC: A guide to the lingo and history of whiskey

In Mr. Cole's final Slow Food Fast recipe, tender, tiny bay scallops, diced honeydew, cucumber slices and bits of cipolline onion are served in a pool of chilled melon juice spiked with serrano chili.

WSJ: Tyson Cole's Bay Scallop Crudo With Honeydew