In summation, simply "Murphy's Law".

Any of certain humorous axioms stating that anything that can possibly go wrong, will go wrong.

The crawling of a student underneath all the desks in a classroom getting to the other side of the room, and back, without the teacher realising. Common during substitute teacher lessons and Chemistry

exagerated or excited agreement with what somebody has just said

1. (noun) The act of sneaking onto a golf course at night with a friend or partner and having sexual intercourse. It is viewed as a daredevil stunt that requires agility and skilled strategics: the performers attempt to get onto the green, have sexual relations, and get off without getting caught by anyone. Experienced performers try to do so while completely naked.

2. (noun) Less popular, having intercourse on a golf course and leaving the fluids from the act on the grass, as a prank.

Verb: to course, to go coursing.

Also: courser, one who goes coursing.
corgie, coursing involving many participants.
PGA tour coursers, a group of professional coursers that course on the holes of the PGA tour the night after each tournament.
courser caddie, someone who keeps watch while two or more people are coursing.
driver, a male courser with a muscular physicality and a large penis.
hole-in-one, a man masturbating on the green of a golf course and shooting his fluids into the hole.

An arbitrary term mainly used for denying something.

When your friend says something you were thinking about, and instead of being a casual and saying "I was thinking the same thing!", you say this to tell him you had a similar brain occurrence

Used with a repeated 'o' sound to express extreme sarcasm or blatant disregard

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Course means harsh, uncomforting often refering to something or someone that is unpleasant. Its most common use is in reference to violence or anger.