I need to pop into the bathroom.
 →  화장실좀 들려야게겠어.
[예문]
A:It's getting late. We have to go right now.
 늦겠어.지금당장가야해.

B:OK.I'm ready. I just need to pop into that convenience store.
 그래 준비됐어. 잠깐 편의점에 들려야해.

A:You don't need to buy snacks. They have popcon and candy at the theater.
  스낵을사 갈필요는 없어.극장에서도 팝콘이랑 사탕팔아.

※  pop into :별안간 오다,갑자기 움직이다 의뜻.
                     pop into 뒤에는 장소를 쓰며 '~에 불쑥들어가다"의뜻을 나타냄.