when a male rubs his penis between another male or female's butt cheeks with out penetrating the anus.

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When a male places his dick (or wiener) between a females butt cheeks (or buns) and thrusts without penetration.

When a naked male gets a boner and sandwhiches it in between his also naked partners ass cheeks, thus forming a hot dog.

Also known as Hotdoggin':
The pseudo-sexual act of placing the penis between the butt cheeks. The Penis being the "Hotdog" and the butt cheeks being the "Bun". There is no intercourse, and usually no ejaculation. This is mainly a comical practice, and usually enjoyed by the giver more than the reciever.

When a man sticks his weirner between a girls buns. Which resembles a hot dog

When a guy places and then thrusts his dick (hot dog) between a chick's ass cheeks (buns) - similar to titty fucking) - there is no penetration; just add mayo (cum); works best when the chick has a lot of "junk in the trunk"