The highest school grade ever. There are 2 reasons people hate people with A+'s:

1. They're kinda jealous.
2. The people who get them are despised because instead of partying and drinking beer until they couldn't see straight lines or breathe anymore, they spent nights studying for that final exam so they won't get SWORDED! by their parents.

the thing that you don’t have when you’re phones percentage is over 20

The highest possible grade. You usually have to work hard to get one. Colleges like Harvard like students who get this grade.

A grade I will never get in school.

(French)
"a plus", short for "a plus tard", that is "see you later".
Used to end an informal email, or a chat
Equivalent to "C U"

Something only attainable by most folk if something is given in return; say a blowjob.

Refering to something awesome, great, sweet, neato, 'ace' or 'off the hook', if you will. An expression to be used when describing something positive, and usually accompanied by a cheezy high-five.