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1.
(expression, slang)
An insulting way to describe someone who has rounded, underdeveloped features and looks like . . . a fetus.

This expression is typically and most accurately used to describe people who come from generations of poverty, such as white trash.
Billy-Bob's dad may have not left him with much -- but he sure gave him a mean case of the fetal face.
by DMS April 06, 2005