[penis swear] 

Similar to a pinky swear, two people must have sex to prove that they are telling the truth. In effect; swearing on the penis.

"I would totally be the best you've had in the sack."
"penis swear?"

[penis swear] by Team J March 28, 2009

Pink Swear 

A promise that is perfectly acceptable to break.

"I pink swear to never try Bud Light Golden Wheat."

Pink Swear by Hamuel Sanwich December 4, 2009

Clinky Swear 

A variation on the pinky swear wherein the deal is sealed with the clink of two glasses rather than the traditional pinky finger clasp.

Done and done. Now let’s clinky swear on it. *clink* 🥂

Clinky Swear by Steph&Ryan February 21, 2019

On swear 

A mix of the phrase on god and I swear.

use on swear when your homies say some real g shit and you can’t decide whether it’s on god or I swear !!!!! On swear !!!!!

Aleiza: “That nigga tit do be thick asf”

Ashley : “On swear!!!”

On swear by Pussy_destroyerXX April 7, 2019

Thong swear

A secret SO DEEP as the thong in your ass SO DEEP though shall never be spoken unless used for blackmail

I thong swear I won’t tell Johnny you slept with his mom.

Thong swear by Kittykatlover456 April 20, 2023

I solemnly swear I am up to no good 

Mischief managed

“I solemnly swear I am up to no good”

I solemnly swear I am up to no good by Billy & Bobby August 30, 2019

i swear to drunk i'm not god

Usually said by drunks.
They think they're actually saying:
"I swear to god I'm not drunk."

Unforunately, they aren't.

Guy : I swear to drunk I'm not god!
Police officer: Okay sir, get out of the car.

i swear to drunk i'm not god by SuperSonicX August 22, 2004