Not suitable for children, especially due to involving excessive sexual, violent, or rude content
Of a motion picture, having an "R rating" from one more motion picture rating authorities, typically meaning it is suitable only for adults.
Of a motion picture, having an "R rating" from the Motion Picture Association (MPA), meaning it is suitable only for adults.
X-rated, pornographic
a fuck / damn.
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.