n. A generous gratuity left by a customer in a restaurant, prompted by the waiter or waitress flirting outrageously. This may include social engineering tactics such as holding eye contact, smiling with teeth showing and touching the customer's arm.
In the case of a waitress and a male customer, for instance, the rule of thumb is: the higher on the arm the touch occurs and the firmer the pressure, the larger the flirtip will be. A casual brush of the customer's hand may generate a small flirtip, while a firm grasp of the upper arm can result in absurdly grandiose returns.
You're leaving a hundred bucks on a fifty dollar meal? Don't you think you're overdoing the flirtip?