Besides being a greeting card company, it also means a male who has no balls. therefore he is way to simpathetic and crys over chick flicks. Enjoys buying stuffed animals and flowers for his girlfriend who has him by his non existent nuts. He listens to his every word as if he thought he could blow a load on it. Hallmark club cards, and "Hallmark" are not that different when you think about it.
Chris: dude, tonight there is an Avril Lavigne concert! i'm going with my girlfriend! i'm going to get her flowers, and candy, its going to be great!
Ben: dude... you're such a god damn Hallmark