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.
by BertyR December 24, 2008

When one needs an extra little time with his lover, and is on an extremely tight leash, he will call his father and shout Gus-sahh! Once his father hears this plea, he will submit to his request.
Bishoy: "ring, ring," (bishoy calling dad)
Father: "hello?"
bishoy: "GUS-SAHH"!!!
Father: "ofcourse I understand"
Father: "hello?"
bishoy: "GUS-SAHH"!!!
Father: "ofcourse I understand"
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