When you sleep with the original person that you lost your virginity to many years after having several other partners. This is in reference to the movie Looper.
Looper: Dude I had sex with my high school sweetheart the other day. I haven't hooked up with her in 6 years!!!
Friend: Wow man! don't you think you're a little young to be closing the loop?
Friend: Wow man! don't you think you're a little young to be closing the loop?
by Slimjimrules2 March 07, 2013