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1.
Rex in Latin means "King".Someone called Rexxy is one who usually thinks highly of themselves.
That Dj called Rexxy James got such high self-esteem, no comment would get to him.
by Swag-A-ticular November 28, 2013
 
2.
someone who has sex with jail guards when in prison
"dude, you were such a rexxy last week"
by borat1234599 September 16, 2008