The question used to be, how long should a guy wait before calling a girl after getting her number? But, with technology taking over our lives and our smartphones being glued to our hands, it is now about what to text a guy after a hookup. But, what do you say? Do you say you had a great time or just be casual? Do you ask him to Venmo you the money for your early morning Uber? Before deciding what exactly to text a guy after a hookup, decide what you want from him.