Use when you know someone is just full of it,ie "whatever","ninja please"
"mhm" - (the interruptor)
Use for quickly interrupting someone, case in point, If you just want that person to shut up
"mmmmmmmhmmmmmmmm" - (extended version)
Use when you know that person is full of bullsh*t.
"mmhmmmmmmm" (extended ending)
Use when you know that person is being mischievous.
"MMMHMMMM" - (physical)
Use with body language to call someone out, ex. turn your head, snap your finger, roll your eyes