mnpt

A sound, like a half laugh with your mouth closed used to say "wtf?/geesh/did you see that/lol." It shows a sense of mild amusement and/or uncomfortableness.

Josh: *walking to the door to go sesh with the bros*
Josh's Dad: "Did you clean your room yet?"
Josh: "Mnpt." *leaves to go sesh closing the door quietly*
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Bro1: "Bro, this shit smacks"
Bro2: "Fr tho."
Dude: "Mkay guys, I'm zooted, finna head home ttyl."
Bro1: "Bro, he left the cart."
Bro2: "Mnpt."