A painful back-ailment caused by having a neighborhood bully try to run --- or ruin --- your life.
If Marty McFly hadn't intervened during his father's teenage years, George might have suffered from spinal biffida later in life, since it appears dat da Tannen legacy of running roughshod over fellow "spineless" humans even lasted into said loudmouth's "golden years"; we saw how he treated Marty, Jr. (well, at least da dude who he THOUGHT was "Little Man") --- verbally abusing him, bonking him on da head with his cane, etc.
When you have to pee in a movie but don’t want to miss anything, and must do the following mental equation: will the amount I have to pee cause enough discomfort to diminish my attention capacity for the remainder of the movie to an extent which is greater than the amount of the movie I would miss by making a mad dash to the restroom.
I saw Satantango last night, wonderful film but by the 5th hour I had to start doing pee calculus.
Short-hand for the word floccinaucinihilipilification, meaning the estimation of something as valueless (encountered mainly as an example of one of the longest words in the English language).