Whenever you're walking underneath a canopy of tree's and an Asian man jumps from a hidden limb, lands on top of u, then takes a massive dump on your neck, right before he cuts your head off.
My brother was jogging on a trail, in the state park, when he got Viet Cong Flapjacked while training for a 20k Ironman course in North Korea!!
When your're wiping your ass, and you check the paper to see if you're clean. It's look clean but a flap of the toilet paper folded over the poop. So you get up and go about your day thinking you're clean. Then you get home and see that your underwear is ruined. You got jacked by the flap. You got flapjacked.
*taking off clothes after a long day* *sees stain in underwear* Oh man! I must have gotten flapjacked.