44944 is pronounced as Sì Sì Jiŭ Sì Sì, which is similar to the pronunciation of Shì Shì Jiù Shì Shì, which means “OK, I will just try.” The numbers are used as an abbreviation for the expression. For example, a person can dare another to do something by saying, “You can try and see what the result is.” The other person can respond, “44944” to show the he or she is not afraid.
Xdjmm is also an abbreviation of a Chinese phrase, Xiōng Dì Jiě Mèi Men, which means “all of my brothers and sisters.” Xiōng Dì means brothers, and Jiě Mèi means sisters. Men means all. The abbreviation is used to call on friends’ attention, for example when someone finds a good product and wants to recommend it, or when he or she has news to share with friends. Girls sometimes use the version Jmm (Jiě Mèi Men) to refer to their girlfriends.
Rp is the abbreviation of Rén Pǐn, which means one’s personality or characteristics. It’s used among friends to tease and have fun. When someone has bad luck or has had a negative experience, his or her friends might say, “Your rp is so low that your life is miserable.” People will also ask their friends to lend them rp’s ahead of important events such as an exam or a presentation.