Lemon panties 

A term incels use to determine a woman's reproductive abilities, usually referring to virgins.

“Age 16-21 have certified lemon panties”

Lemon panties by Kat3556372949;92@29 September 19, 2022

Lemon panties 

A woman can be certified to have lemon panties only during her peak reproductive years, assumed to be aged 16-21.

First relevant use in r/badwomensanatomy. Used in a particularly boomer take on the “age hierarchy of a woman’s relevance.”

Those eighteen year old girls have certified lemon panties.

Lemon panties by Bexie B. January 30, 2022

you must be fun at lemonparties

The subtle way of calling someone a creepy old man who would most likely fit in a scenario similar to the lemonparty shock site.

Joe: I heard there's a new Swingers' Club just north from here.

Jake: You must be fun at lemonparties.

you must be fun at lemonparties by Jay Had April 16, 2014