Combination of "whey" and "waifu".

Whey is a milk-based protein used by fitness people for building muscle.

Waifu is a term coined by otakus for their fictional anime/manga wives.

A wheyfu is a girl, real or not, who hits the gym for strength and you find attractive.
"Look at her muscles and how gorgeous she is. I'll make her my wheyfu!"
by RunningFranco April 3, 2021
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Derivative of waifu, a waifu that is ripped or very muscular.
Did you see how fit that girl is?
Thats a wheyfu, my boy.
by Velon April 3, 2018
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