Shorthand for the three key Rust Belt/Upper Midwest states of Wisconsin (WI), Michigan (M), and Pennsylvania (PA) that have decided a multitude of Presidential Elections from 2008 to 2020.
Most notably, the three states are much more white demographically than the country as a whole.
Trump's win in 2016 was powered by his surprising strength in WIMPA, even though he polled poorly in these states.
A male who is impressively athletic even though his belly is larger than average. Wimpas are often at the height of 6'6, and seen as true vikings. They are very smart, usually with an IQ above 150.
"There is a very tall and smart person with a belly larger than average over there!"
"Oh, that's a Wimpa."