boi is as an acronym for build on ice, usually within the context of instructions for mixing a drink. boi can be used interchangably with rxs (phoenetic for rocks), although generally rxs is reserved for straight liquor drinks (e.g. "Scotch on (the) Rocks"). Often times, the term boi will come after the type of glass the drink is to be served in. As an example:

Black Russian
rocks, boi
1.5 oz. vodka
0.5 oz Kahlua
(top with cream to make White Russian)

Other ways to prepare a drink include:

For more information, be sure to check Everything Bartender

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