n.: the opposite of a "bubble butt," the square butt is most often found on nappy white chicks. When using the square butt for sexual satisfaction, it is advised that a pillow, or some other cushioning device be placed between the wee-nis and the square butt to prevent bruising the male reproductive organs.
"Man, I hooked up with this square butt chick last night for two hours!"
"Are you shitting me? You wouldn't be walking if you did..."
Nickname given to bales of marijuana thrown overboard or out of airplanes. Origin is reportedly from members of the US Coast Guard in the area of Southern Florida.