Simply means "your mum is". It is an vietnamese sound translated to english language. Originally used by the members of the NA gunz clan HondaR (BertyR and __VT__). Often used when they are disapointed.
A hacker enters the gunz room, __VT__ says me gu may!
লিখেছেন- BertyR 16 de এপ্রিল de 2007