1
When a girl with big knockers intentionally or accidentally slaps her boob in your face or almost hits your face. It has to be within an inch. It can happen during sex or when she leans over and slips.
My girlfriend thought she was giving me a hug, but it turned into a faceful of joy.
I was eating a taco when she leaned over and gave me a faceful of joy.
He was trying to ask me a question, but I accidentally gave him a faceful of joy.