sneaky selfie 

When you get someone (friend, sibling, child, pet, etc.) to pose in a picture with you so that it does not appear to be a "selfie". But, the purpose is still to take a photo of yourself for social media.

"Look at John. Posted another pic of him and his dog. He's a sneaky selfie addict!"

"Little Jonny..come here and get next your Mommy so I can take a picture of myself for Facebook." Mommy is taking a sneaky selfie.

sneaky selfie by TheWrench January 5, 2014

sneakover 

the same as a sleepover except it is with a romantic or sexual partner whose parents make them sleep in separate bedrooms, requiring one to sneak out of their current room to their partner's.

"My parents will make us sleep in different rooms, but we can have a late night sneakover."

sneakover by sincere January 28, 2015

sneaky shag

When someone sneaks away for a social gathering to engage in coitus

Person 1: Where's Alex?
Person 2: He went off for a sneaky shag with Karen.

sneaky shag by Where did I leave my tardis November 4, 2015

Sneak Beefing 

Sneak Beefing Is In Other Words Sneak Dissing Or Talking Bad About Someone Behind Their Back.

"I Can't Stand All These Sneak Beefing Mofos Ruining My Rep!"

Sneak Beefing by UltimateXer April 10, 2016

Sneak French 

When you go in for a kiss and slip your tongue into your partners mouth instead.

Babe come on I just want to kiss you, stop sneak frenching me!

Sneak French by Marcus shlang September 18, 2016

Sneaker Rat 

Someone who collects a lot of dope shoes

"Yo, Kirk, you're such a sneaker rat!"

Sneaker Rat by Connor Wilkinson September 10, 2016

sneak pee 

When one two males are urinating in a bathroom, and one guy surreptitiously looks over at the other guy's junk to get a "sneak peek" at his jewels

"Bro, I was peeing, and Rodney took a sneak pee at me!"

"Dude Josh totally just sneak peed me in the bathroom. Wtf!?"

sneak pee by NitchBigger August 4, 2016