Unsure of one word word, "ガン." Although even if I were more confident in it's meaning, I'm not sure I would really have much of a different translation. So the gist of it is there at least...

Catloaf said:

Unsure of one word word, "ガン."

ガン飲み はどういう意味ですか? | HiNative said:

”ガンガン飲む”の略語で、簡単に言うと、いっぱい飲むということです

とてもたくさんお酒を飲んだり、ものすごい勢いでたくさん飲んだりする時に、若者が使う言葉です。

Laethiel said:

Ah okay, so from "drink" to "gulp down" it is.