Top definition
When a woman doesn't shave "down there" and the resulting pubic hair resembles Osama Bin Laden's beard, espcially when wet.
"Dude, did you hit that?"

"No, she had an Osamabush...out of respect for my Country, I couldn't do it."

or

"Hell yeah, I went GIHAD on that Osamabush!"
by Funny Dude 33702 December 04, 2009
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