A fork of Rural Dictionary
The act of flipping the vaginal flaps open whilst simultaneously inserting a finger into the vaginal crease and slapping the girl on the ass.
Chad went to Becky's house for a little Flipflap-Slipslap.
When you go to slap someone’s asscheek and miss and it makes the missed slap sound.
I got the worst slipslap from your uncle Ralph.