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A bossy gay man who exercises autocratic authority over his group of friends, most often in social and cultural situations. The group of friends can be straight, gay or a mixture of the two. Said group tends to be very afraid of contradicting the gaytriarch for fear of repercussions that generally include loads and loads of drama.
Craig: "Why do we always have to go along with Adrian's plans?"

Michelle (exhales cigarette smoke): "Because Adrian's our gaytriarch, that's why."

Nicole (whispers): "Shhhh! Here he comes!"
by cfbaines December 03, 2009
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2
A ubiquitous homosexual well known in a gay community; that guy or girl that every gay person seems to know. Not necessarily a leader, but a popular or prominent member or figurehead of a GLBTQ social group.
Longinus: "Hey Pepper, you know Rod Hardthick, don't you?"

Pepper: "Of course. Every gay person on this campus has at least heard of Rod. He's a total gaytriarch."

Celebrity examples include: Neil Patrick Harris, Elton John and Ellen
by khaodic April 20, 2011
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3
A parent or grandparent, who used to be straight, or at least straight enough to have procreated (or adopted).
"I dropped mom off at the Out Bar. It's gaytriarch night."
by Gaytriarch in Chief August 16, 2016
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4
Someone born before it was even legal to be gay, who has worked hard to get us the equality and legal recognition we enjoy today.
"Jim's a real gaytriarch. He claims to have been the first publicly "out" gay man in Michigan, and even though he's almost 90, he still works hard for the rights of 'TBLG' people."
by Gaytriarch in Chief August 16, 2016
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