b4i√uru/18?

shortened way of saying the phrase "before i root you are you over eighteen?" using the square root symbol and / divide or (numerator) over (denominator) to replace the words of their respective names.

The joke comes from an episode of the australian tv show 'Summer Heights High'

"i shortened the sentence "before i root you are you over eighteen?" to "b4i√uru/18?""