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Cissie is a diminutive contraction of cisgender. It is used jokingly by transgender people as a flippant retort to those who would call them 'trannies'. The intention is to convey the message that being transgender is no more to be ashamed of than being cisgender.
Did you cissies really think that calling me a tranny was going to upset me?
by Angelica Perduta June 04, 2016
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