empty promise 

When someone promises you something but then doesn't follow through

My mom promised that I would get an ombre for my birthday but then she changed her mind and wouldn't let me. One more of her empty promises.

empty promise by angelinaglows January 10, 2014

Empty Promise 

Eating while defecating, particularly when planned and intentional

“Did you make a bowl of cereal before you went to poop?”
“Yeah, just a quick Empty Promise”

Empty Promise by PercyP September 24, 2018

Empty promises 

When one masturbates to no conclusion- usually due to lack of concentration or fatigue.

The 90 year old retiree excitedly woke up for the first time in 20 years with an erection, but in the end, he was handed only empty promises.

Empty promises by Joe_Mamma May 18, 2006