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The act of assuming a fetus like position in which the body is curled with knees into chest; this is commonly due to a high intake of THC; a symptom of the itis
Man, Marcus got too high again, looks like he's fetusing.
by project420 May 13, 2009
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when a person is randomly in a corner or crouched in a fetus-like postition rocking back and forth and wimpering.
i looked over and she was fetusing.
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When two people wrap themselves in a blanket to pretend they are twins in a womb. Often done as a street performance by homeless derelicts.
"OMG Tiffany, Where is Michelle?"

"She's in the back room fetusing with Bobby, what a slut!"
by meow13242 September 25, 2016
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