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When you lay flat on the floor like a dead rat after eating too much. Best done right next to a table full of food so everyone can see your shame.
After my grandma's lasagna, I did a full Finbar in the middle of the dining room.
I Finbar'd during the dessert course and got yelled at by my aunt.
Finbar'd so hard after the pizza that my brother took a photo and posted it on Instagram.