Above Ground Pool 

In dating/mating terms, an 'above ground pool' is someone who typically wouldn't be your 1st choice...but start to look more and more appealing when you have no other options. It may not be ideal, but at least you're getting wet!

I hooked up with Dave last night. He's a total above ground pool, but sometimes you just gotta swim like no one is watching.

Above Ground Pool by BklynSlope718 June 16, 2018

above-ground gene pool 

Reference to the genetic composition of those who are generally considered to be stupid, ignorant, or crude. Refers to the view that above-ground pools are inferior, tacky, or déclassé.

Would you look at that knuckle dragger...he definitely comes from the above-ground gene pool.

above-ground gene pool by ntvnykr October 7, 2006