Back in the days of cowboys and indians. The cowboys would go out into the loan range for long periods of time, and come back with only the clothes on their back. This would mean they would be forced to strip down to there boots (which would be left on to avoid rattle snakes)to wash their clothes. Hence in order to avoid confusion with passers by, the cowboy would shout (or call if you will) "booty, booty" so people would be able to take measures to avoid seeing him.
ergo Booty Call
Alan: And that's how the term "booty call" came around.
Jake: Oh right.
Kandi: So when did it start to mean "casual sex"???
(noun)a phonecall,page,or conversation aimed at getting into your pants.Not an invite to a movie or dinner, not just coffee, not a casual or formal get-together, just a plain old-fashioned "let's fuck"
I woke at 4 a.m. with a massive hard-on. I picked up the phone and gave Ruthie a booty call. I wanted to mount her so very, very much. I had it REAL bad !