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!"
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