To release a drawn arrow. In reference to said arrow being fired from a bow, thus flying through the air.
John: I just pulled up on some kids and let it fly.
Sam: Epic...
by NotPieGuy August 25, 2021
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to do something with a serious risk that would reap an equally serious reward if successful
If someone risks his career for a loved one, that would be letting it fly.

If someone takes a shortcut while driving by quickly going the opposite direction on a one way road when time is of the essence, that would be letting it fly.

similar as to throw caution to the wind
by Nathaniel Bacon March 13, 2009
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When you and your friends decide to throw stuff at people while in a moving vehical. Before you throw what every your throwing you hang out the window and yell "Let it Fly"!!!
by OxGXBxO April 9, 2010
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The belief that when you are engaging in sexual intercourse with a woman who is pregnant, they can allow their semen to be inserted to the woman's vagina without fear of impregnation.
"Ever since Autumn became pregnant, Kyle has been letting it fly."

"After Katie became pregnant, Scott asked her if he could let it fly. But, she laughed at him. "

"Having a false understanding of the definition, Eric thought he had a free pass to fuck Dennis in the ass in a restroom. Now Eric has AIDS, not HIV, but full blown AIDS."
by Lkjhgfdsa1234567890 April 28, 2013
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Another way of saying fart, let one rip or let one tear
Jimmy just let one fly and it smells like a pile of rotting parsnips
by samstorm December 5, 2004
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1. to throw or shoot

2. to launch vigorously into something
After loading their rifles they both let fly with them.
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I ate a chili dog last night and I woke up this morning and immediately had to let the parrot fly.
by Calling Buicks June 2, 2017
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