Banang is an inherently funny word, and is treated as such within the game settings. Max gets tired of it rather quickly, though. If any character makes fun of the name too much, expect another character to throw it out of their sight.
Tycho: 'Aren't you, like, ten? '
Strong Bad: 'You, shut face. They also shake up some decent... bananaang. Banang. Banaaa-aaang. Baaaaa-'
Max: 'STOP IT!'
Strong Bad: '...Nang.'
Guybrush: 'Banang. It's like grog for monkeys. And a leading cause of simian diabetes.'