Secretion from the urethra (piss-pipe) that accumulates under the foreskin and emits a chessy odour if the individual has not taken care of their personal hygiene. Similar to 'wet tail' in rodents.
Joanne gagged as Lionel revealed his wet knob and demanded she suck it.

Your wet knob stinks more than my queef!

"Oi Phil, get your wet knob off my clean sheets, you bitch", yelled Robert
by Emma & Jo September 26, 2006

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