1. sexual escapades that need to be performed in extreme acts of stealth and slyness, such by needing to remain anonymous to others around you.
2. sex at a party, movie theatre, or in the back seat of car when there are front passengers, in a house occupied by people other than yourself. where all acts performed must remain in shadows and be virtually silent. usually with clothes only 1/2 or partly off.
3. extremely drunken or high sex to where you are under the influence or alcohol or beer googles and the person you wake up next to you was definitely not the person you had remembered in your head. if it wasn't for their swift ninja like actions and your slightly impaired frame of mind then this wouldn't have happened. therefore ninja sex.
I hate when my inlaws come in town to visit. That means we have to have ninja sex for an entire week!
Do you remember Joe that frequents the bar? Yeah, I was pretty messed up last night and thought I was taking home a Dwayne Johnson look alike. When I woke this morning next to me I see Joe passed out! Damn ninja sex, if not Joe wouldn't have had a shot in hell!
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