The alpha nigger in a group of tough-looking, hostile, or loudmouthed niggers. The nigger in the group with the loudest voice, or the one that the others seem to defer to (out of fear).
We were walking down the street when we saw a group of 8 or 10 black males in front of a liquor store talking and yelling in a hostile manner among themselves. Suddenly one of them in the loudest voice of all, starts yelling to tell the others where they should go next. Luckily we were walking on the opposite side of the street from these low-lifes, when my girlfriend, referring to loudest guy, turned to me and said, "Hey, check out Chimpus Maximus over there!"
A euphemistic metaphor for a woman's vaginal area when she is on her back and her thighs are spread (in ready-to-fuck position) to form a shape resembling the curvature of the surface of an equestrian saddle.
I was on the outs with my girlfriend for a while, but now I'm back in the saddle again.
A good example in music is the sexy 1980's country music hit by Mel Tillis, "I Got the Horse (i.e. penis) and She Got the Saddle (i.e. pussy)", with the chorus line, "together we're gonna ride, ride, ride!"
Another: In the movie Semi-Tough, when Kris Kristofferson finally gets the woman he loves, Jill Clayburgh, back in bed and is ready to fuck her (you can see his big hard-on poking up the sheets) the background music starts playing Gene Autrey's 1940's cowboy song, "I'm Back in the Saddle Again", as the scene fades.