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1.
When a man has sex with a woman on her period he pulls out and "red stripes" her cheeks, giving her the appearance of a brave Navajo warrior.
The navajo is the perfect way to mark your territory
by Brandeen June 20, 2007
 
2.
When having sex with a girl from behind, the act of grabbing a handful of hair and pulling back in a scalping motion, whilst flapping your other hand over her mouth, causing a native american-like sound effect, hence the moniker, "the navajo"
I was givin my girlfriend the navajo the other night, after we smoked the peace pipe
by george karl October 11, 2006