Oh, that's Charlie Zelenoff. He's like 300 wins and 0 losses in underground boxing matches. He's also won a few against dominos delivery drivers and unsuspecting pedestrians. (we have a thread about him here but it sucks)
G.O.A.T. is a song by polyphia though, it's kind of cool, I've always found their use of percussive techniques on electric guitar and slap bass to be very interesting
The goat (Capra hircus) is a domesticated species of goat-antelope typically kept as livestock.