The act of tucking your penis and nuts between your legs and holding your legs together tightly to look like an ugly vagina (just like your sister Sally). Otherwise known as the Buffalo Bill. This maneuver is usually followed up by spinning around and bending over to produce the fruit basket.
My bitch girlfriend left me on the side of the road in Gaysville, so I had to sister Sally to get a ride. It's ok though because I got to show my fruit basket when I got in the truck.
by UncleChester September 8, 2011
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Sister Sally is the random man in a group who's duty is to wear the skirt and be the dumpster for the day. Generally approached from behind, the skirt is pulled over the bussy's head to hide his ugliness.

Story's vary over the origin of the name Sally, from pirate days taking turns in the barrel to desperate sister who would do anything for attention.

We usually call him Mark.
Me and the boys drew straws but I think you just like to volunteer to be sister Sally.
by JoeyKissyFace August 9, 2020
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