An item taken from a person's home, car, or any other personal space to be later used as an excuse to see said aforementioned person.
Girl 1 "Dude why are you wearing Kevin's hat?"
Girl 2 "I stole it because I want to see him again later. It's my take-away. Duh."
An item left at/in someone's residence, car, bag, etc, used as an excuse to see said person again.
"I hope I get to see Jeff again. I left my sweater in his car as my go-back."