1. The opposite of an alpha male (an "A" male); a male who earns a grade of "F" (or "phi" in Greek) on the manliness scale.

2. A woman; a female.
The ancient Greeks rated a man's worth very similar to grades in school. The most noble and respected men were grade-A - "alpha males" - and the remaining levels of mankind were grade-B or "betas", grade-C or "chis", grade-D or "deltas", and the lowest grade was "phi"--an F. Naturally, in that era, women were ranked all the way at the bottom, with the very lowest of the low. And to this day, women are still referred to as "phi males" :D
by bemorechadlike September 1, 2021
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A male who hangs around females more than with males. He feels that females understand him more than his mates. Rarely heterosexual.
"Where is Ben?"
"He went with Clarissa and her friends for an ice-cream."
"That damn Phi Male."
"Do you think he is gay?"
by CoffeeK_ February 8, 2021
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