"Ydym" in texting typically stands for "What do you mean?" It's often used in casual conversations to seek clarification or further explanation about something that was said. The abbreviation reflects a trend in digital communication to shorten phrases for quicker exchanges.
FR in texting means "for real" as an exclamation.
ths stands 4 this in texting
imf
Call Me
Yyp
Hurry Back
BTR
haven't had sex
laugh out pee
no one cares
Cracks me up
Face Time