Sneaky Molusk 

When you sneek up behind someone and unexpectingly grab both their nipples and give then a double nurple so hard it makes them cry also known as a double nurp

When I Sneaky molusked Vinny he screamed like a little bitch and then told me the next day both his nips were blue.

Sneaky Molusk by From THS Pit Tim Vinny Mike Brian Chase October 13, 2004

sneaker squid 

To surprise another.

Origin: During mating season, an inferior male squid will lay in wait while a more dominant male squid courts a female squid to lay her eggs. The sneaker squid dashes in and fertilizes her eggs before the alpha squid can do the deed.

He came outta nowhere and sneaker squided me!!! I almost jumped out of my skin!

sneaker squid by Mandi&Geoff January 21, 2006

Sneaky Zeeck 

While you are having sex with a girl from behind, you "accidently" pull your dick out too far and then you sneak it into her butt.

Yo girl, you act right and Imma finna give you a sneaky zeeck.

Sneaky Zeeck by kzizzle May 14, 2007

Sneakyhandshake 

When a german guy spins you on your head and put multiple rubber fists up your ass and then shouts "NIGGERS ON THE POOP DECK"

Sneakyhandshakes are hard to find now a days.

Sneakyhandshake by Stimpered March 2, 2009

Sneaky Heckler

A movement that involves two people about to kiss, but one person sneakily cops a feel of the second unsuspecting person just as their lips connect. AKA "the surprise second base"

"Wow, did paul just go for a sneaky heckler on andre?"

"So we were drinking and right before we kissed he tried to pull off a sneaky heckler."

Sneaky Heckler by Gdizzle420 April 14, 2009

sneakbutt 

during casual sex, discreetly remove penis from the vagina and place it in the anus without the female partner stopping to realize and/or care you have performed this sexual act.

James performed a sneakbutt and he was a legend

sneakbutt by Ted from Accunting May 1, 2011

Sneak-Thief 

A sneak-thief is any type of stealthy, ninjaesque, tricksy, pickpockety character in Skyrim. Hold Guards spend much of their time talking down to sneak-thieves.

"Hands to yourself, sneak-thief."

Sneak-Thief by Aghabajab April 4, 2012