Can be heard being shouted in the gym when
pushing out that last rep. Similar to Rocky Balboa shouting "Adriaaannn!"
Has expanded in it's use to describing
something that is pretty powerful or
strong.
"Come on man - one last rep."
"Amissshhhh!" (Rep successfully pushed out)
OR
"
Wow man, look at that
guy go"
"Yeah that is some serious Amish right there"