could also be that thing you do (to put it lightly

) after a few rounds of enema with water/waterleaf "juice"
I can hear it now, "come on! relax your belle. open nyash small. na only 3 dey remain and u dey tight nyash like this. ok you are done but don't go to the toilet just yet. Standa there, shake belle small" ROFLMAO! LWKMD!!