X-rated, pornographic
"The film was banned from mainstream theaters because its plot revolved entirely around explicit sexual acts and nudity."
a fuck / damn.
"The patient's diagnosis of tetrasomy X was confirmed through genetic testing that revealed the presence of four X chromosomes instead of the typical pair found in female karyotypes."
Tetrasomy X, a rare chromosomal disorder affecting females, caused by the presence of four X chromosomes instead of two present in the usual human karyotype.
The word comes from the Australian brand of lager that adopted this name to reference the old practice of using repeated X's to show drink strength. It gained popularity through advertising slogans claiming Australians preferred it over any other beer.