何やってんの

what are you doing?

→ 何
phrase Rare #38,503
what are you doing? Informal contraction of 何をやっているの. Depending on context, it can also ask what something is doing or what someone is doing with something.
JA: 今、何やってんの?
EN: What are you doing right now?

何やってんの

What are you doing?

— 映画 聲の形 (2016)

この人何やってんの?→

What is this person doing?

— 映画 聲の形 (2016)

これ何やってんの?

What are you doing?

— One Cut of the Dead (2017)

これ何やってんの?

What are you doing?

— One Cut of the Dead (2017)

まったく何やってんのよ

What on earth are you doing?

— 天気の子 (2019)