(adjective) A person who strives to remain in someone's (
potentially a superior's) good books and will do anything including feeding the persons ego or snitch on other people. Similar to a teacher's pet or prefect.
Derived from the
relationship of a mouse and cheese. The person, or cheese, has no real substance or integrity, but a small minded mouse will always seek them (an eat them) to make themselves feel better. The cheese will also act all happy-go-lucky by smiling
all the time (like saying "cheese" in a photo) and acting as if they are god's gift to the earth