You don't know? Mostest of people on Earth know a superduperlative noun is when 2 "est"s encompass a word. Best you look for an example below.
jkfdafwufjakfdksuperduperlative nounjrwrmruwaekjoralk;rcajkra
Someone: Hello!
Person 2: Hi!
Bestest you know what they mean, everybodyestest does.
Person 1: It's the best outside!
Person 2: Well it's bestest we go now!