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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?
by Slimjimrules2 March 06, 2013
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2
The act of sucking one's own dick.
After hours of diligent stretching I was finally successful in closing the loop, then my mom walked in.
by duhlek January 28, 2009
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