The urine excreted from herbivorous insects of the suborder Caelifera in the order Orthoptera - aka the grasshopper. It is fabled in The Flood that drinking 3 quarts per day of grasshopper pee will stop the aging process, allowing eternal life. It was known in ancient times as "the Peelixir of Life". Its common street name is "GP". Some members of The Flood believe grasshopper pee does not exist based on their disbelief in insect urethras.
Bob: Hey Bill, watcha doin'?
Bill: Drinkin' grasshopper pee.
Bob: Oh, okay.