when a married/taken person is caught having hot monkey sex in a cheapmotel or other locale with someone other than their SO. especially applies to congressmen and famous people.
hillbilly 1: well John Edwards, i reckon you really got caught with your hand in the nookie jar.
a distorted but clever mis-read of "in the nookie jar" typically committed by non-native english speakers, lazy readers and people who get really excited by the word "nookie," but which has valid usage:
1. covert nookie
2. covert expression of nookie
3. a doubly emphatic expression of the same
4. the version of "caught with your hand in the nookie jar" that doesn't involve being caught
5. surprise nookie
"me and my boyfriend are taking a car trip...you know, a little nookie in the jar."
"i'm going to surprise her on her birthday: a little wine, some candles, and i've got a extra-special stash of nookie in the jar"
when you're holding up your phone and making faces at it, as though you are taking a selfie, but you're really taking a picture of the person across from you or the wall or anything else that seems interesting but you don't want to be caught dead taking a picture of.
This action is often made more convincing by wiggling the eyebrows or opening the mouth, to pretend you're trying to get a Snapchat filter to work.
FRIEND A: "Did you just take a stealthie of me?"
FRIEND B (turning phone around): "no I was just using snapchat's new filter, see?"