He is a two-fisted drinker who never seems to get drunk.
two-fisted drinker
idiomSomeone who can handle their liquor well
Everyone at the party was surprised that he remained perfectly sober, as he is known to be a two-fisted drinker.
Despite the endless rounds of whiskey served throughout the long evening, the two-fisted drinker maintained his composure and sharp wit until the very end.