A day when a part of seniors, especially the ones that don't have AP or honor classes, don't go to school which causes the school a big financial damage since it doesn't receive government's money for 2/3 the class yet has to pay the same amount for teachers, subs, utilities, etc.
Senior ditch day is often agreed among some students to pick some days that are special.
In my school, senior ditch days are days when the day and month added will be 9, like 2/7, 5/4, or 12/6
Fogey/fogy /fougi/ sl. (early 18C+, orig. Scot) old-fashioned, stuck-in-the mud.
Person with old fashioned ideas which he is unwilling to change: Come to the disco and stop being such an old fogey!
You think me an old fogeyand an old tory, his thoughtful voice said. I saw three generations since O’Connel’s time. I remember the famine. Do you know that the orange lodges agitated for repeal of the union twenty years before O’Connel did or before the prelates of your communion denounced him as a demagogue? You fenians forget some things. (James Joyce, Ulysses. Penguin Books,1992. p. 38)