Lookin-flat

Guy with a small penis so that they have no noticeable bulge when wearing clothes.

Those jeans have him lookin-flat.

He has a cute face but lookin-flat

Sock

Specifically, twinks that are exchanged for sex just as frequently as socks. This can be used for any type of person as well.

It's sad to bring your sock to dinner after use, just get a new one.