When a person is so hungover they can't stop vomiting and every time they drink water it comes back out their mouth like a waterfall, because it's coming out of their mouth away from them it's like they're chasing it.
by MidgeToDeath May 21, 2015
A woman ,particularly an older woman,who desires sex and is chasing after younger men to achieve an orgasm.
Waterfalls by TLC
Person 1: Mary's so horny she will do anyone to get laid and have an orgasm
Person 2: Yeah she be chasing waterfalls
Person 1: Mary's so horny she will do anyone to get laid and have an orgasm
Person 2: Yeah she be chasing waterfalls
by gasmanrobe August 15, 2010