If you've watched the movie, you'd know what terrible people Manav and his mother were.
His mom was a stereotypical Indian snobby mom, who wanted her daughter in law to only make babies. And Kabir hated his sister's treatment by both.
So in this scene the MIL is spewing typical shit like "main apne praan tyag dungi"...Kabir being Kabir and hating her anyways couldn't yell at her due to age difference and relation...so he chose a subtle way to be savage.
What he wanted to say was "arey aaj kya kal hi pran tyag deti, le main madad kar deta hu".
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