Rollin' down the street smokin' and, uh, sippin' on gin and juice

The story:

I was with my boyfriend in the car singing my little heart out, and he stopped me and said "what was that?" This actually happens quite often, because I love to sing and usually don't care whether or not I know the words.
I don't think it's anything to be embarrassed of, but now people tease me because I didn't know what endo was.