Momister 

A sister who is your mom, vice-versa for a mom who is your sister.
Originates from my very own momister fiichen uwu

fiichen from roblox is my momister

Momister by i love fiichen sm sms ms smsms December 13, 2019

momster 

What happens after your Mom counts to three.

Mom: 1, 2, 3
Child: Oh no, she's becoming a Momster

momster by Yermy Battled Warter December 8, 2016

moisteras

A spanglish term for very attractive girls who you think you could hook up with.

"Hey Timmie, take a look at those moisteras, let's see what you got".

moisteras by B Wabo April 29, 2008

Moister than an Oyster 

Making someones pu55y so moist that she becomes a watergun or lawn sprinkler.

Mike Dillon makes girls "Moister than an Oyster"

Moister than an Oyster by TwistedTaffy July 15, 2017

momster 

A word used in conversation of siblings to complain about their mother. Comes from "mom" + "monster" = momster.

The momster is really angry tonight...

momster by Kitten123 July 28, 2005

Momster 

A mom who is extremely scary, or scary looking.

Boy: Dude, that hag is a total momster!

Momster by Notorious VIC January 25, 2010

Moisterbate 

The act of masturbating furiously with extremely sweaty or clammy hands, creating friction burns on the shaft and making it impossible to finish.

Dude I was moisterbating so tough last night and now my cock burns like a mother fucker. I won't be able to jerk off for at least a week.

I hate it when my dick bleeds after I moisterbate hard with my sweaty hands. It just completely ruins my day!

Moisterbate by Chief Fat Cock February 23, 2011