直筒子

zhítǒngzi ㄓˊ ㄊㄨㄥˇ ˙ㄗ

    • a blunt, straightforward person
    • plain speaker

Character by character

Saying俗语俗語

Idiom惯用语 · Widely known

Literally
straight tube
Meaning
A blunt, straightforward person who doesn't beat about the bush.

Sources