The act of obsessively thinking about or fantasising about your crush; whether you aren't with the person, are with the person or was with the person(i.e. your ex). It is the result of uncontrolled attraction. Symptoms of this little recognized, little respected but dangerous phenomenon includes but are not limited to:
a) Writing down the object of your attraction's name over and over again.
b) Constantly daydreaming about what it's like to be with your crush.
c) Obsessively planning or thinking of possible future events (first kiss, first date, wedding, number of kids, etc).
d) Constantly thinking about the possible reignition of a past flame long after a break up.
e) "He loves me, he loves me not. She loves me, she loves me not."
Girl: " I can't stop thinking about him. Like, omg he is sooooooo cute. I think our babies will be cute. I hope me and his mom get along. I'm sure he's the one." *sigh* with a smile while looking upward.
Girl's rational friend: "Ummm okay Cindy, first of all you barely know him. Secondly, you're setting yourself up for all kinds of emotional distress when things don't happen the way you obsess about it."
Girl: "Can't a girl dream?"
Girl's rational friend: "Sure, but what you're doing is not dreaming, it's mental stalking."