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3.
Girl who doesn't swallow or lick cum off a penis when she's done leaving it all messy.
That girl is such a knob slob, she refuses to swallow.
by Anonymous October 29, 2003
 
1.
(verb) The act of performing highly skilled fellatio in such a manner as to provide great joy to the recipient.
His girlfriend knew how to knob-slob like there was no tomorrow.
by The Empress II October 24, 2010
 
2.
a blowjob
Dude, I got a wicked knob slob the other night. The girl was like a vacuum.
by ravenshadow October 05, 2003
 
4.
when ur gettin ur dick sucked and when shes done u still got knob slob on your dizznik
the bitch sucks good dick but she keeps leavin knobslob
by aaron fullwiler April 23, 2007
 
5.
person who gives messy head (knob=head of penis; slob=messy, untidy).

See also knob slobber.
Erotic magazine advertisement, ca. 2004: "You can go from knob slob to blow job champ (by buying this book) . . . "
by al-in-chgo June 16, 2011