What it means
Weaponized incompetence is pretending to be useless at a task so that someone else gives up and does it for you. Load the dishwasher badly once and you'll never be asked again, that's the whole strategy. It usually comes up around household chores and unequal relationships, where one person plays hopeless on purpose to dodge the work.
Usage examples
"He says he just can't fold laundry right, classic weaponized incompetence, he does it badly so I take over."
"Stop with the weaponized incompetence, you run a whole department, you can book a dentist appointment."
"My flatmate's doing that weaponized incompetence thing again, suddenly he can't work the hoover but somehow he can build a gaming PC."
"She keeps calling it weaponized incompetence because every time he cooks, the kitchen looks like a crime scene and she ends up sorting it."
Where it comes from
The phrase started circulating online in the late 2010s and really took off in the early 2020s, especially in chats about domestic labour, dating, and office life. It builds on older ideas like strategic incompetence, with weaponized making it clear the useless act is deliberate and used to dump the job on someone else.