24p simply means the TV can display at 24 progressive frames per second (same as the film rolling rate in cinema). HDTV commonly accepts 50p/60p and better ones accept 24p.

I've seen a true 24p Blu-ray demo disc connected to a 24p TV and i just cant bear the low frame rate jagginess. 24p does not smooth up the video at all.

thanks for the correct term 

i'm saying watching 24p BD, not broadcasted content (can one do that anyway?)
you mean the TV actually displaying 24p contents at 72Hz?
then the 3x frame rate is interpolated or just repeated frames?

my real confusion is that, while 24p supposed to make movies look cinematic, i get more of the "stutter" (low frame rate) feeling rather than cinema feeling. i swear i don't realize that much of "stutter" while watching movies in cinema.