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1.
A very popular guy ( Indian hindi slang.. )

A mature guy

An Indian guitar player

Lead guitarist for Indian rock band.
1)Tushar to Siva,"Ooh, that guys is so nishchal, I envy him.."

2)One musician to other,"Play like nishchal dude.."

by the_one_one January 16, 2008
 
2.
When someone likes to toot their own horn, they are colloquially referred to as "Nishchal"
Hey that amateur photographer from San Diego, he is such a Nishchal; no one cares about his stupid photos but he can't help being a Nishchal
by gotham2 October 17, 2012