A person who only drinks beer, wine, and other fermented alcoholic beverages and refrains from drinking distilled liquors and spirits like vodka, gin, rum, tequila, etc.
Can you order me a beer while I run to the bathroom, I don't drink distilled alcohol anymore because I'm a fermentarian.
The act of shoving grapes up your partners ass, making them clench until the grapes turn to liquid, plugging them, and fucking them to the desired time, then draining the poorly fermented grape juice into a cup, drinking half, and spitting the rest into their mouth for them to enjoy.