When you eat spicy food and the next day you take a poop and the spices from the food make your booty hole hurt and the poop is also explosive in nature.
"Hey guys, it's Fartnpoopnman, today I'm gonna be filling my turlet with a Pyroclastic Nasty Blasty cause of all the Mexican food I ate last night"
To be used your cumshot goes an impressive distance, much like the sniping of famed US sniper and war hero Chris Kyle.
"Yo dude, I didn't beat my dick for 3 days over vacation! When I got home, I fired off a huge Chris Kyle!"