undersorter 

Undersorters don't like going to the trouble of sorting things into categories. When they pin things, (on Pinterest), they just put it all up on one page. If an image link directs you to the Pinterest page of an undersorter, you will likely scroll all day before locating the original source for that image.

Too bad the only Google image for this thingy takes me to this undersorters Pinterest page. Now I'll never find where to buy it!

undersorter by huntkitten December 7, 2017

underfooter 

something that gets in your way

Dug stumbled leaving the kitchen, the underfooter created by his cat forced him to snag a napkin on the way out

underfooter by dug1970 February 25, 2011

Underseater 

An underseater is when someone defecates on the outer edge of the porcelain toilet bowl, underneath the seat and then carefully brings down the seat, resting it on top of and hiding the poop from view. When the next person sits on the toilet the users weight compresses the seat on the poop, spraying it in all directions.

Dan got Rick good with an underseater prank. The poop sprayed all over his legs!

Underseater by Brainietta August 4, 2020