This word is used in a few different ways:
Ex. 1: To signify that everything is the same or unchanging.
Ex. 2: To signify that one doesn't care.
Ex. 3: To signify a hopeless uncaring.
The word is considered slightly vulgar by some older people but many young people throw it around without a problem.
Person 1: "Ei, kaip gyveni?" (Hey, how's life?)
Person 2: "Viskas pochui." (Everything's pochui (the same)
Person 1: "Mano mergine vel nemyles mane..." (My girl doesn't want to love me anymore)
Person 2: "Bliamba, man pochui, nesvarbu" (Dammit, I'm pochui (uncaring), this doesn't concern me)
Person 1: "Sveiki, kaip sekasi?" (Hey, how are you doing?)
Person 2: "Man pochui...nebenoriu gyvent..." (I'm pochui (hopeless)...I don't wanna live anymore...)
Person 1: "O, Nebukit kaip emo pyzda!" (Oh, don't be an emo pussy)