Chamar is a Dalit sub-caste; mainly found in the northern states, such as Punjab, Haryana, Himachal Pradesh, Uttar Pradesh and Bihar; whose traditional occupation is leather-working and tanning.

As sandeep said is right but also ,
when we tease someone we say the sometimes as CHAMAR

Cha = Charm = skin

Ma = Mans = muscle

Aa = Asthi = bone

Ra = Rakta = blood.

So, Chamar means Manav (human)

C for uttam chritra m for mercy r for rakht jo bha hamara ab ham bhi bahayenge

Chamar is basically a combination of two words, 'Ch' and 'Mar'. 'Ch' comes from sanskrit background and is a sort of acronym for the word 'Chandervanshi'. 'Mar' comes from persian background and connotes Naga origin (mar in persian mean naag). Chamars are therefore the people belonging to the 'Naga clan' of the Chandervansh race. The word has nothing to do with the occupation of dealing with leather though many of the people of this clan had to opt for such occupations after coming of Aryans. After the invasion of aryans, the Chamars were further divided into number of sub-groups which ultimately became untouchable castes and one such sub-group carried its original name 'chamar', whereas other subgroups were called by different names such as megh, batwal, doom, mahar, etc.

Chamr ka matlab jo mare hue janawar ki khal uske badan se nikalta hai use karm se chamar kaha jata hai

Coblar who mends/ makes shoes...

Y u askin dese type of ques.?????? as i said u previously it's nothing only a man made word.

It is cast

One who deals with the leather ,manufacture articles from leather is called CHAMAR, in north india it is a cast