1. (v.) the act of going after your friends' ex
girlfriends or girls
your friends are
interested in
2. (v.) the act of ditching your friends for a girl you have no emotional attachment to
3. (n.) someone who doesn't care about his friends
"Bro, don't jacobdane. I really like her. Stay out of her inbox"
"You say you're
doing laundry but you're really jacobdaning us."
"Don't be a jacobdane. We're
supposed to be
your friends."