By my reckoning, "yaaaas queen" is a culturally-specific exclamation, though I cannot be sure if the one I've below described is the one the other member had in mind for what I'll share below pertains to an expression that'd be written and punctuated as "yaaaas, queen!", the exclamation point indicating intonation and emphasis, not the volume with one might utter the words.
What I think the saying means:
- The "yaaaas" is merely the spelling of "yes" said in an exasperated way.
- Judging from the lingo my gay friends have used over the years, I think "yaaas, queen" is a spelling depicting an affected intonation for "yes, queen," and, AFAIK, "yes, queen" is phrase used in the LGBTQ community. It roughly carries the same meaning and tone as "yes, Miss Thing," "yes, bitch," "no, 'ho,'" or "yes, Negro," as uttered by a person of whom there's not the barest possibility that s/he means the noted noun in a remotely derogatory or otherwise personal or offensive way. The exasperation of the speaker (not an implied reference to/about the receiver) must be the only thing taken from the speaker's having uttered the phrase.
- One drag queen can say "yes, queen" to another drag queen.
- Gay men of a certain age and who aren't drag queens can say "yes, queen" to other gay men of that era who will, given the temporal commonality of their gay experience, understand "queen" as something of a convivial and commisserative term.
Like other culturally-specific expressions used by members of minority groups, "yes, queen" is a saying non-members are well advised to eschew using outside of rarefied and very specific circumstances. What are those situations? I can't enumerate them all, but I can say that if one uses such a saying/term and gets "askance" responses (subtle or overt), one used the saying in a setting/way one should not have.