Mah-had
It is a British slang for something which is out of the ordinary or something wild.
British people normally say 'mad', but this emphasises the state of shock of someone.
It can be used two ways:
1) Wagwan G why you moving mahad like that
2) Yooo! That's mahad brudda!
Violating a duck on the beach with a twix bar
Cassio was sangawanging Bernardo the duck