From Wiktionary, the free dictionary
Literally, “even if you kill me”, or more loosely translated as “you might as well kill me”.
хоть убе́й • (xotʹ ubéj)
- for the life of me
Хоть убе́й, не по́мню.- Xotʹ ubéj, ne pómnju.
- For the life of me I can't remember.
