Second-rounder 

In the dating game, a second-rounder is a person who didn't get married in their 20s like 1st rounders. They're usually still in "game shape" for sport fucking, but for whatever reason, the mental game never clicked and could never get married and retire from The Game.

Second-rounders are typically primo picks for divorced 1st rounders who are still in Game Shape themselves, but now have to get back into The Game

A milf got married and had babies, but a Second-rounder never got picked from the sidelines before their 30s.

Second-rounder by Leon_Washington August 9, 2021

Secondrounder 

30 something yuppies, who in their late 20's blindly decided to get married and shortly after the dust settles find themselves divorced, with alimony, and at your local corner bar drinking the latest trendy drink and eyeing the crowd for their next victim.

Not to be confused with a Cougar; Secondrounders are younger with or without children but looking to marry again.

They also travel with their best friend who is still married and provides emotional support until a new mate is found, this is done in the hope that couple to couple outings to Home Depot and generic strip mall restaurants can recommence.

"That party was filled with nothing but married couples and secondrounders!"

Secondrounder by Trad Hughes April 2, 2004