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
1 more definition
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.
by wind talker of the aboriganees April 16, 2005