somebody who is unbelievably unpleasant and stupid, but believes they always know best!
Jeremy : Brian just told me it's £30!
Kyle : But his XBox is brand new!!
Jeremy : I know!
Kyle : What an Uncle Munty!
or all round tosser
who's legendary ability to be awkward, difficult and obnoxious have gone way beyond the average cock to become a cock meister - king of twats, master of cocks and all round uncle munty
Martin ass-kissed his way to management and then expected everyone else to pucker up for him, like the cock meister he is.