Any beer low in alcohol content that is also highly quaffable. A style of beer you would want to drink after working hard in the yard on a hot summer day. Usually a crisp pale lager or ale with moderate to high carbonation. Must be well chilled.
Lawn mower beer style examples include American Light Lager, Cream Ale, Blonde Ale, Standard/Ordinary Bitter. Commercial examples include Sam Adams Light, Genesee Cream Ale, Abita Golden, Redhook ESB.