Ass (butt) in the air, posed, waiting for sex. Sexual position.
I flipped her butter side up.
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A greeting found in some parts of the mid-west United States where in partners stand very close and proceed to press their pelvises together whilst knocking on the butt cheeks of their brethren with their fists. Quasi-sexual. Usually reserved for close, or odd persons. Alien in human nature, not in a cosmos way.
Man, I hadn't seen her in so long I had to give her an alien fistbump.
An alliance of or with reptilians, in the extra terrestrial context.
The grays enaged a repliace to overpower the humans.