The act of filling a bathtub with water and bubbles, then sticking an erect penis through the top
"My sister came in to wash herself in the tub, but she got a nasty surprise when she saw a floating sausage sticking out from the bubbles."
To probe your partner with a stick or something similar, and shove it so far up their rectum that they begin to bleed and their eyeballs pop out of their skulls. CAUTION: Your arm may require cleansing afterwards.
Joe: "I totally alienated her last night!"
Yuri: "Do me next, and do it hard!"