1 definition by The sane one.

Similar to Smegma.

Fermunda refers to the inevitible build up of a cheesy-like substance around a man's genitals when they are unwashed for a period of time. This phenominon appears particularly after a period of lovemaking.

Fermunda stems from the proper "From under."
Damn look at the cheese I got fermunda my nutz.
by The sane one. October 19, 2004
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