Acronym for а хуй/хрен/хер знает, usually given as an evasive answer with a varying level of rudeness depending on the middle word implied.
Игла: На скоpой помощи было написано какое-то слово, где 2 буквы Ю.. какое? Напpочь забыла…
Alexander Kolomoyets: АХЗ! Я в Одессе был лишь pаз, и то пpоездом pано утpом.
Igla: There was a word on the ambulance with two Юs… what was it? I’ve completely forgotten…
Alexander Kolomoyets: IDK! I was in Odessa only once, and that was just passing through early in the morning.
(fido7.pvt.girls, 08/2004)