From Wiktionary, the free dictionary
Literally, “you may suck on my dick”.
bỹbį náchui galì čiul̃pt
- (very offensive, vulgar, colloquial) fuck you, fuck; no way (used to express refusal)
Gál dabar̃ tù nueĩsi? - Bỹbį náchui galì čiul̃pt!- Could you go this time? - No, fuck you, fuck!