Because the Word of the Day from Dictionary.com is “toper.”
toper TOH-puhr, noun:
One who drinks frequently or to excess.
Although he was no toper, God forbid, he took a glass of aquavit . . . .
— Isaac Bashevis Singer, Reaches of Heaven
But there remains a core of bottom-line voters to whom the promise of tax cuts is as seductive as gin to a toper.
— David Nyhan, “Tax cuts for all – wheee!”, Boston Globe, January 21, 2000
You may walk around a bar with a big mug of beer . . . , but if you sloshed it all over a fellow toper, you’d pay the cleaning bill.
— Randy Cohen, “At Random: Everyday Ethics”, Chicago Tribune, June 10, 2003
Toper is formed from the verb tope, “to drink,” originally an interjection used in proposing a toast, from Frenchtope!, “agreed!” from toper, “to cover a stake in playing at dice, to accept an offer, to agree.”