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1.
A contraction of the word knob gobbler. A person who performs fellatio
Diana is Shah's knobbler.
by Bob'syeruncle January 10, 2009
 
2.
the reverse equivalent of a "motorboat".

A person accepts a mans soft genitals into their mouth and vigorously shakes their head back and fourth while producing various sounds from the throat; used to prepare a man for (oral) sex.
"I just couldn't get in position so she suggested a knobbler to get the process started. Within moments I was ready for her"
by anonymous2587 November 19, 2013