When a plan is made after a night of intensive alcohol consumption and has a very low percentage of actually occuring. Called 'Pepperoni' , as this most likely occurs at a pizza place.
EXAMPLE 1:
"Urg, last night I told a guy in my class we should start a study group and be best friends. What a pepperoni promise"
EXAMPLE 2:
"Tomorrow I am going to wake up and be a better person. I am going to take care of myself, do some community service, oh yeah, tomorrow I start my journey!"
Next Day: " Yeah, that was a huge pepperoni promise.. I'm not doing any of that"