Sidepiece 

A woman whose one level above a jump off but always below the wife. A sidepiece must know her part. While he may meet your family. You will never meet his. A sidepiece is a women he will never commit to. A sidepiece will never be wife material only an easy fuck.

Mary, Teresa, Amanda, Kim, and Christina were my sidepiece.

Sidepiece by Barr Nass February 18, 2019

Portable Sidepiece

A sidepiece who is ok with and even happy to be your sidepiece even when you break up with your main piece. A portable sidepiece has no aspirations to be your primary relationship and will remain with you through multiple primary relationships.

Person A: I broke up with my boyfriend.

Person B: So your side piece is gonna be your main now?
Person A: No, he is a portable sidepiece, I can take him with me to the next relationship.

Portable Sidepiece by BlacknessComfirmed August 15, 2022

Hawaiian Sidepiece 

Fashioning an ad hoc Fleshlight by carving a hole in Spam for one's manhood. Vacationing in Hawaii and/or pineapple rings is optional

I forgot to pack my porta-vag so I guess i'm going to have to go full ham and whittle a Hawaiian Sidepiece in the Spam

Hawaiian Sidepiece by Bigevilguy August 24, 2023

rocking a sidepipe 

When a male wears pants so tight, the outline of of his genitalia can be seen. Hence, giving the impression that he is rocking a sidepipe.

"Johnny wears pants so tight, he's rocking a sidepipe 24/7."

rocking a sidepipe by brianxymox July 16, 2006

Side Piece day

February 15th The day men take there side piece(the other girl he is dating on the side) out as if it were Valentines day.

Tommy bought 2 bouquets of Roses One for his girlfriend on Valentines day and one for his side piece on side piece day.

Side Piece day by Onblast! March 2, 2011

slicepiece 

a girl of whom you would like to fornicate with. "slice" refers to the act, and "piece" refers to the person of whom you want to fornicate with.

She is a slice piece.
I wanna slice that slicepiece.

slicepiece by Sahns of Durham December 6, 2010

side piece 

The other woman. Also see Goomad.

My side piece is tight!

side piece by Louie March 15, 2005