Sneaky Postman 

When one individual defecates inside another person without their noticing, usually the anus.

I totally delivered that chick some sneaky post last night.

Oh man, I feel full.
You might've been given the sneaky postman.

Oh god, last night was messy. I think I received a sneak post on the dance floor.

Sneaky Postman by The Postmaster November 7, 2013

sneaky swap 

Sliding naked into your flat mate's bed when his or her partner is already there and waiting for your flat mate to return, then preceding to snog them. Lastly, post coitus, you must shout, "Oi gov thanks for givin me the ol sneaky swap!"

"I was about to get it in with this hot chick but after sex, I realized my roomie got me with a damn sneaky swap."

sneaky swap by Tankkard December 25, 2013

sneakie 

A sneakie is a photo you take of someone without them knowing.

Girl: I totally took a hilarious sneakie of Ann sleeping

Guy: Quick, take a sneakie of Dan doing that ridiculous dance

sneakie by tegs May 21, 2014

Sneakrim 

The act of surprising your partner with a rimjob during oral sex. This is often given to someone who has never received a rimjob in the past.

Hey, how'd it go last night with Rachel?

Great! She said she wasn't into anal, so I gave her a sneakrim.

And?

She asked me to keep going.

Sneakrim by CarTripin May 22, 2014

Sneaky Fraser

To slip a finger up the lady's arse whilst she cums from oral sex without any warning

Dude I gave her a sneaky Fraser last night

Sneaky Fraser by Evie one June 7, 2014

Sneaky Wank 

A technique used by Corrode to polish one off in a room of men.

Fucking Corrode just had a sneaky wank in the bedroom!

Sneaky Wank by Guarana June 28, 2014

Sneaky Porn 

SKEAKY PORN:
(Snē•kē - pôrn)

1. VERB: The act of surreptitiously placing pornographic images in hidden, unexpected places, whereby a person would unlikely, yet eventually stumble upon it.

See: Sneaky Poo

2. NOUN: Pornographic images that are found after being purposely hidden in unexpected places as a practical joke.

1. "We're gonna Sneaky Porn that house!"

2. "I just found Sneaky Porn in my fireplace!"

Sneaky Porn by Tristessa_27 October 8, 2014