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plankfuck 

Sex where, usually the partner on top, is in a plank position. The bottom partner can be in any position underneath and any hole or area can be being penetrated: mouth, anus, vagina, breasts. The key is that this action also doubles as an intentional intensive core and ab workout for one or both partners.
Damn, my abs are looking ripped after all that plankfucking last night. I’m skipping my core workout at the gym today!
plankfuck by Sheilalee July 17, 2018
Related Words

planefucker 

One who fucks planes/obsesses about planes
Mike stop being a planefucker
planefucker by TimmothyMcBumbsquat November 14, 2018

Planck fuck 

The smallest possible unit of giving a fuck—an indivisible quantum of concern. Analogous to the Planck length in physics, it's the theoretical minimum amount of care one can give before it ceases to exist entirely.
“I don’t give a single Planck fuck what you think.”
“That’s a Planck fuck less than I gave yesterday.”
“Somewhere between zero and a Planck fuck is where my interest resides.”
Planck fuck by TT126 July 1, 2025

Plantfucker 

In works of original fiction on AO3 using the “Human Domestication Guide” trope, plantfucker is a derogative term used by anti-Affini humans against more Affini-sympathetic humans.
Did you see the Affini broadcast? Those xenodrugs seem pretty sweet!”

Jesus Christ, I never would’ve figured you for a plantfucker!”
Plantfucker by veganavegana November 16, 2023