steamboat

Similar to motorboating.

Instead of placing one's face between a female's breasts, an individual instead elects to place his or her face between a woman's ass cheeks and performs the same actions one would do while motorboating.

Chuck: Hey Zach, what's that brown smudge on your nose?
Zach: Haha, I was just steamboating my girlfriend a few minutes ago and I guess I forgot to towel off

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