sneaky panda 

A person who intentionally displays a humorous or awkward facial expression in the background of a photograph.

The picture of us at the bar was good except for that sneaky panda in the booth behind us.

sneaky panda by Tater Po August 18, 2010

sneaker male 

In marine biology: a male fish that disguises its appearance as a female to sneak into other males nests to fertilize eggs.

In human biology: That somewhat effeminate guy who is "just a friend" of your girlfriend, but will take a stab at her if you get in an argument or are travelling.

Guy: That Aaron guy drives me nuts - do we have to hang out with him?
Girl: Oh, Aaron? He's just a friend! Don't worry!
Aaron (in background, to self): "I'm gonna pound your girls ass the first chance I get!" Aloud: "Oh girl, do you want to go shoe shopping?! I heard there's a sale on and afterward we can chat over coffee!"
Guy (to self): Damn sneaker male!

sneaker male by Pomacentrus2 December 19, 2009

sneakover 

the same as a sleepover except it is with a romantic or sexual partner requiring one to sneak out of the house for it to occur.

Hey, do you wanna have a sneakover tonight?

sneakover by brooksbrother July 9, 2009

Sneak 100 

The sneakiest of sneaky, the hardest to find.
Also relates to a person who posts a stolen meme and doesn't get caught.

That guy has sneak 100.

Sneak 100 by a pankek February 17, 2019

Sneak Dissin 

When punk bitches get together and talk shit about somebody but won't say a name

Her: Girl that hoe ugly
Her friend: I know
Me: Who y'all sneak dissin
Them: She know who she is

Sneak Dissin by ZiggyPettyAss August 19, 2015

Sneak-Gumming

The act of getting chewing gum from your pocket, bag, place of storage, when surrounded by a large (or if you're greedy, a varitably small amount) of people, as so that the surrounding people do not notice you have gum, and hence will not request gum from you, depleting your store that was meant for the next week and a half.

Guy 1: "I see you have a fair amount of Gum there, Guy 2."
Guy 2: "Yeah, I've been Sneak-Gumming all week! Them vultures don't got nothin' on me!"
----
Man: "*Chew*"
Everyone: "GOT GUM?! GIMMEGIMME."
Man: "Damnit I've never been very good at Sneak-Gumming".

Sneak-Gumming by Jamieleets April 6, 2010

Sneaky Aaron 

Is the act of jerking off into a shampoo or conditioner bottle of some brutal looking bar hag that you just picked up because she wouldn't give you any action.

I pulled a Sneaky Aaron on that bitch, she's gettin my load over the top of her head wether she wants it or not!

Sneaky Aaron by JTeazy April 4, 2010