What is the meaning of xx in texting?

Read also:

• Why do women stubbornly refuse to let men lead, even though they are attracted to the man, and the man both loves and desires them? Why do they get angry and blame the man when he gets fed up and walks away, when it's entirely their own fault?
• Can you share a story of someone who had a lucky experience while hitchhiking?
• Physicists Propose Cheaper Alternative to Particle Colliders: Supermassive Black Holes - Gizmodo
• If a female has XX chromosomes and a male has XY chromosomes, what chromosomes do transgenders have?
• Why do people think Mirko is boring in My Hero Academia?
• Sophia Bush Says She Endured “Every Kind of Abuse” on Show Due to Older Man - The Hollywood Reporter
• What's the funniest thing you heard in a movie theater?
• What kind of person makes you think "how come there are people like that"?
• How can couples reverse the buildup of resentment once they notice it?
• When a black man and a white woman have a child, does the child become white? If a white man and a black woman have a child, does the child become black?
• Vienna calling: Strauss's 'Blue Danube' waltzes into outer space - Phys.org