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.
Example:
"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."