An undefined substance, usually of a sticky or slimy consistency. Conjures images of snot, semen, crushed insects, bile... Marm is generally unpleasant, and is used most commonly in negatve connotation. Most likely derived from marmalade.
"Ugh! There's some kinda marm all over this table!"
"He smells heavily of man-marm... I'm sure his genitals haven't seen a wash in days"
by Crom! July 24, 2006
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