Here's my serious interpretations.
This song is about being addicted to weed or something like that. Maybe one of the members was addicted to something like that. But lyrics are often personal things. People write lyrics to let go of grudges and stuff so maybe they wrote this song based on their addiction but didn't want to be known as potheads so they changed it to quesadilla, thinking people would just joke about it.
Here's my serious interpretations. This song is about being addicted to weed or something like that. Maybe one of the members was addicted to something like that. But lyrics are often personal things. People write lyrics to let go of grudges and stuff so maybe they wrote this song based on their addiction but didn't want to be known as potheads so they changed it to quesadilla, thinking people would just joke about it.
well, that's my best attempt.