고 저러다

this way and that way

저러다 is 'act like that', pointing at something away from the speaker, and it mostly comes paired with its twin 이러다, 'act like this'. Those pairs are set phrases: sometimes this way and sometimes that, this annoys me and that annoys me too, and 이러지도 저러지도 못하다 — unable to do either thing, stuck. Used on its own it is disapproving, as in going around like that in slippers.

Register: casual spoken