when the penis of one man is inserted into the anus of another man and then moved in and out with great force and speed so as to create a stimulus for both men
When a woman has a nice round ass plumping all up in her pants, she is bootacious.
When grooving to jazzmusic its best to be smoking a nice stogie, sipping on whiskey and moving to the beat with a bunch of bootacious ladies all around.