japanese fire cracker
When a male is performing anal sex on a female (specifically in the reverse cowgirl, or the missionary position) and the female proceeds to extricate feces in the midst of anal sex onto the males genitalia
Him: Hey babe you want to try the Japanese fire cracker?
Her: yeah sure I haven’t shat in 3 days let’s do this
Her: yeah sure I haven’t shat in 3 days let’s do this