Definition of can't judge a book by its cover

My face may look innocent but be prepared for what I will do

After you cover my face, I’ll have to wipe some off to see

May I fart in your face?

I may have an innocent face, but you should never judge a book

I may have an innocent face, but you should never judge a book

I may have an innocent face, but you should never judge a book

I may have an innocent face, but you should never judge a book

I may have an innocent face, but you should never judge a book

I may have an innocent face, but you should never judge a book

I may have an innocent face, but you should never judge a book

My ex never allowed me to ride his face...May I ride yours?