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The yearly anniversary of a transgendered person's first dose of hormones.
Hey, did you hear that Aiden's celebrating his ten year tranniversary by finally going to the water park?
by drdearn August 15, 2010
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An anniversary of a trans person coming out. (Combination of "trans" and "anniversary"
Friend: how long have you been out?
Me: 5 years tomorrow
Friend: nice, happy tranniversary
by amb2323 May 22, 2018
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