What is Bueller?
1.
A reference to the movie "Ferris Bueller's Day Off"
Used as filler when nobody responds to a question or statement.
Person 1: Has anybody seen my hat?
Person 2: ...
Person 1: Bueller?
2.
From the title character in the classic movie "Ferris Bueller's Day Off".
To take time off work, in an unauthorised and if possible un-noticed way.
Most commonly to leave work for lunch with a few close friends and not come back.
Slacker1: How's it going?
Slacker2: Man. I pulled a bueller yesterday afternoon and my boss didn't even notice!
Slaker1: Excellent.
Slacker2: Yeah.
