Water The Ferns

A phrase uttered by a female to a work colleague, in the office, to be excused to escape to the bathroom/restroom, from a long laborious meeting, to go urinate. Its slightly more polite that "pee", though those that use it are rarely polite outside of work. Claims of the ferns being neglected or thirsty means she is desperate.

"I have to go water the ferns for a few minutes" - is a sign of a normal require urination
"I have to go water the ferns as we have neglected them" - is a sign of an urgent need to pee like a horse