Traditional brewer's mark for barrels of extra strong beer—extended to other alcoholic beverages and other products having an extra strong dimension (varying from washing soap to pornography).

Extra strong; very high quality. / Designating extreme or hardcore pornography.

(transitive) To delete; to cross out, especially to conceal or suggest vulgar language.

(medicine) Triple X syndrome.

An abbreviation for kisses, usually placed at the end of a letter or text message, often alongside ooo (hugs).

Third-person singular simple present indicative form of XXX

(chiefly clothing) Initialism of extra extra extra small (the manufactured size or an item of that size).

(chiefly clothing) Initialism of extra extra extra small (of the manufactured size).

(Bowdlerisation) 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.