行くん

go

→ 行く
行く to go + ん informal explanatory ending
verb · informal Rare #43,607
go In casual questions, ん is a colloquial form of の and adds an explanatory tone.
JA: 今日はどこに行くんですか?
EN: Where are you going today?
Conjugation of 行く

どこ行くんや?

Where are you going?

— バトル・ロワイアル (2000)

どっちへ行くんじゃ

Which way are you headed?

— 風の谷のナウシカ (1984)

ちょっと待てどこ行くんや?

Wait a second—where are you going?

— バトル・ロワイアル (2000)

あんたどこまで行くん?

How far are you going?

— すずめの戸締まり (2022)