crickmar is a name meaning nouveau riche tasteless fool.
Nouveau riche, meaning working class new rich, instead of aristocratic old money and class.
another definition is that 'Crick' means new rich and the 'Mar' means bad taste, poor taste, vulgar, con man, spiv or classless sham. All in all it refers to someone who is thought of as a pathetic joke.
Gentleman 1 ; " look at that Del Boy character over there with his roll of notes at the bar "
Gentleman 2 ; " oh good lord ! call security ! we don't want some vulgar little Crickmar bringing down the tone of the establishment "