Zumping

The action of taking a persons foot and inserting it in the vagina of another person causing the person to become extremely aroused.

“Last night me and my girlfriend were zumping!”

Grumping

The action of giving someone a footjob covered in human feces, then proceeding to eat it all off.

“My friend and his girlfriend were grumping all night!”
“I gave my friend a grumping”