momcest 

Momcest is porn that is only about mother and son/daughter

I was bored last night until I found some momcest.....the rest of the night was awesome

momcest by ThatGamerGuyMicheal January 23, 2017

Momcert 

A concert mostly attended by moms.

How was Celine Dion?
Not bad, but it was a bit of a momcert.

Momcert by Newton Orchid September 25, 2017

Mocest 

When somebody called Moses or somebody who has their name beginning with 'mo' fucks their sister and says that it isnt their sister.

''Oh no! Moses is fucking his sister again! Nasty Moses with his Mocest!''

Mocest by TotallyNotDaiko123 October 13, 2019

modcest 

Sexual activity with someone in your APSC Module project group at Queen's Engineering. Often leads to an ex-boyfriend/girlfriend that you have to see and work with every week for the rest of your first year.

Person 1: "wow, alex really comitted modcest with that dime in his project group"

Person 2: "that's gonna be awkward during the next TRAT"

modcest by cykblat November 19, 2020