When one has sex with a girl who is on her period and has a tampon in.
Example 1
A: Dude that sex was so bad I think i saw a tampon string hanging out...

B: Oh dude you totally pulled a jonah

Example 2
*Boy tries to take off girl's pants as they hook up*
Girl: I can't... we wouldn't want to pull a jonah.
by thafeld October 13, 2011
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