Can't see me

originally comes from the idea that the white man can not see the black man's struggle, or perhaps chooses not to see his struggle.
The phrase has been adapted as a statement of toughness to indicate superiority.

refering to someone who is not on your level or who you believe is below you

Another way of saying that you are untouchable and put everybody else to shame. Basically means you are unstoppable because if a person or thing can't see you they can't catch and/or attack you. Even though you are entirely visible it is a way of telling somebody that they can't fuck with you and they are not on your level.

A common thing John Cena will say to you if you mess with him. He will show off first and do the Five-Knuckle-Shuffle on you. Then you'll pretty much have 2 teeth left.

What someone says as they cover their eyes and pretend to be invisible. They are looking for attention, so give them some, THWAP!

Can't see me was a theory explored by Albert Einsten on why John Cena can't be seen by the naked eye. Within the first week of investigations Einstein had a blood vessel burst near his heart, leading to his death.