Baltimore baker's rack
Sex act, like a Cleaveland steamer, in which the woman kneels down and supports her breasts with her hands while her partner squats, facing away from her, and defecates on her chest.
"After a few natty-bo's, that chick got down on her knees to give me a rim job, and before she knew it, I was givin' 'er a Baltimore baker's rack."