What does FOS stand for?

Full of Stool (medical slang)

This definition appears very rarely and is found in the following Acronym Finder categories:

Slang/chat, popular culture

Other Resources:

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Samples in periodicals archive:

Pulse and respirations are absent, and the infant''s diaper is wet and full of stools.

Sudden Infant Death Syndrome-Diseases

If the child's rectum and colon are packed full of stool (as determined by physical examination or an x-ray of the abdomen), he or she has a retentive encopresis, whereas a relatively empty lower bowels, indicates non-retentive encopresis.

Constipation and fecal incontinence. (ask the doctor)