1 definition by darthjoey90

Having a pregnant women produce her milk into your anus directly, letting it travel up to your rectum, and pushing it back out as if you were shitting.
Guy 1: have you ever tried a butt lactation
Guy 2: no bro

Guy 3: I have its pretty fun
by darthjoey90 October 1, 2015
Get the butt lactation mug.