momstress 

When a mother has too intimate a relationship with her adult son.

My wife sat at the table fondling our son, with intimate hand and footsie play, like she was his Momstress.

momstress by Dorky D October 2, 2021

Elvira, Mistress of the Dark 

That's the name of the comedy/horror movie that she's in. She's Very Sexy & wears an Extremely revealing long black dress & is Gorgeous! She's a great actress & icon.

Some of her friends think she looks like Elvira, Mistress of the Dark!

Elvira, Mistress of the Dark by Starchylde June 8, 2016

five finger mistress 

Simply the hand you use to masturbate.

If your girlfriend doesn't do it for you your five finger mistress will.

five finger mistress by VitoVane November 12, 2017

Sinistrous Mistress 

A sexy, left-handed woman. Also known as a sinister sister.

She's left-handed and a little bit sinister. She's a sinistrous mistress.

Sinistrous Mistress by yo-yo-ma-ma March 22, 2011

professional mistress 

An upscale prostitue who services a small number of men (usually executives) on a regular, long-term basis in exchange for them contributing to her financial well being. Each man may call on her anytime on his regular day (eg. 1st & 3rd Tuesdays). If he needs her for a Friday,Saturday or other days, additional negotiations are necessary.

I could never be a protitute - having to hustle for johns and taking risks, but being a professional mistress is great because I am in control of who I see and when, and the guys I pick really take good care of me.

professional mistress by myplayfulvixen October 25, 2007

Manstress 

The male equivalent to a mistress. A married woman's side piece. A second dick you get when the first dick isn't satisfying you. A boy toy. The man you use, abuse, and throw away on top of the man you come home to every day.

Jamie: "Hey, was that Josh I saw you with on Saturday?"

Tammie Lynn: " Oooo girl PLEASE that was my manstress. I get a piece of him when Josh's dick just ain't cuttin' it."

Manstress by redrum this bitch August 2, 2016

Dairy mistress

When dating a vegan, you're likely to not eat animal products when eating dinner with them. However, you likely eat animal products when at dinner with a friend(s) who is not vegan, and this friend(s) is/are your dairy mistress(es).

If your partner is vegetarian, the friend(s) would be a meat mistress(es).

Bob: Dude, I totally couldn't eat this grilled cheese if Susan was here; she became a vegan 6 months before we started dating. You're so my dairy mistress.

Dairy mistress by TwistedColorArrangement September 13, 2012