Pronunciation of "It's your..."

[lupo.hp]

Hello, I'm a songwriter, and I am planning to use the expression "like it's your special day" in a song of mine. However, when it comes to pronouncing it, it comes natural to me to pronounce "it's", more like a "issh" sound (just like 50 cent does in his famous track "In da club", when he says "party like issssh your birthday"). Is this a proper/correct way to pronounce it? Is it a slang?

thank you

https://youtu.be/5qm8PH4xAss

 

[emsr2d2]

In normal everyday speech, many of us make "it's your" sound more like "it-sure" or "it-shore".

 

[lupo.hp]

Thank you, you've been precious!