Flapjack/ˈflæpdʒæk/ Definition 1 of 2Pro Tip 1/3UK Snack In the UK, 'flapjack' refers to a sweet, chewy oat square, distinctly different from a pancake. At the cafe, I ordered a flapjack to go with my tea. Pro Tip 2/3Not Pancakes Don't confuse UK flapjacks with pancakes when in a British context; they are quite different foods. For our picnic, I'll make flapjacks, not pancakes. Pro Tip 3/3Customizable Treat In the UK, flapjacks can include various added ingredients, like nuts or chocolate chips. This flapjack has cranberries and seeds in it.