"Based" is a specific online subculture slang for something wholly positive, the opposite of "cringe".
An example would be:
"I think you should be able to shoot sales people for ringing your doorbell"
"Based"
But what online subculture? A cringe subculture? Isn't something that is positive to a cringe subculture cringe to everyone else?
Then again, there have been based vegetarians! So go and contribute your recipes!