when you are fucking your guy in the ass and then proceed to get another guy to unknowingly suck your dick post ass fuck
"Last night I fucked Mikey in the ass and then gave Andrew a burrito surprise."
When you put an object into your vagina to store it. Similar to the keister, but with a vagina.
"Tomorrow, on my trip from Columbia, I know my ass will already be full so I will have to try pooniting it the extra bags of cocaine!"