Something that is not worth the effort. Does not apply exclusively to television shows, it refers to anything time-wasting, annoying, moronic, or even something that's "not your cup of tea." Derived from the National Broadcasting Company's slogan for their upcoming fall line-up of 1995: "Must-See TV."
President Biden is addressing the nation? Must-Miss TV.
Weaton and Scalzi? Must-Miss TV!
When Miss Yapp whips out the metal detector in exams
Take that phone out your pocket or you'll get absolutely miss-yapped
Surging one's pace too early or too fast during a run or race and failing to keep it. This often results in hitting the wall, and irreparably kills a runner's chance to run a good time.
Damnit! I tried to pass that group on a hill and I ended upmissing a gear. I fucked up the rest of my race!