A foreign object one sticks up anothers ass when he/she is mad. Also used for measurement in few cases.
Ruler has to definitions:
1; Someone who rules others, like aking, queen, prince, government, ect
2; A flat stick that is used for measuring commonly in cms and inches.
Mrs. Lolleio told us to measure our hand length with our brand new ruler. (s)
It means.. somethin' as "I'm teh best" or somethin' like that.
h4H4h4, iM t3H rUl3R 0f tH!z G4m3 !!1!1!oneone!!!11!!!!
(hahaha, I'm the ruler of this game !!!)