The act of one stalking another and then randomly humping that person because you think it is funny and then suddenly running or sneaking off like an average pedobear .
Dude1 : did you see what Erick did yesterday !?

Dude2 : No , what'd he do ?

Dude1 : He like totally came up behind this chick and started dry humping her . We checked to see if the girl was okay and then I looked up and saw him dipset around the corner .

Dude2 : Hahaha , Eicks a Rape Ninja .
by midnightmyst March 26, 2011
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raping someone without them knowing it. has to be done in three steps.

1. scream (known as ninja approach)
2. rape
3. leave note

it's nice to let people know they have been raped, it's the polite thing to do. that's why we leave a note.
Can't remember being ninja raped, but this note totally says I did...
by captain rape July 16, 2010
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ninja rape occurs when a person is suddenly in your personal space on your ass..
you turn around and someone is suddenly on your ass out of no where with no warning at all and the intent was not to scare you but to have a legitimate conversation or conduct some sort of business. hence ninja rape.
by Cartera6 December 25, 2009
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When you put on all you can gear from last hunting season and proceed to sneak up on your cousin and bend him/her over and start jamming you 3inch errected penis into their asshole while pinching their nipples but in the end the cousin really enjoyed it
by Datboi1234 July 7, 2017
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