A combination of retard and "Rx", the latter of which is a commonly used abbreviation of "prescription".
A Rxtard is regularly abusing prescription drugs such as xanax, hydrocodone and adderall.
Some Rxtards also like to brag about taking these drugs and feel cool for doing them. They often act carelessly and don't give a fuck about their surroundings.
Jamie: ayo tyler wanna come over
Tyler: bro I'm off 5 xans call me tomorrow
Jamie: you're such a rxtard
A very cool OMORI fan. Also a GHOST EYES fan, this person just might take the name of “Most perfect person”. An omori and ghost eyes fan?? You never see those!!
Person one: “Hey, is that rxtt3nx?”
Person two: “huh? Oh yeah!!”
Person one: “he is so cool!! I never see ghost eyes fans!!”
Person two: “I agree!! Except im more of an omori fan than ghost eyes fan, its nice to see someone likes both!”