"Sexy and I Know It - DJ Hero 2" is a high quality rip of "Sexy and I Know It" from DJ Hero 2.
2 contributors awkwardly sing the lyrics of the song "Sexy and I Know It" by LMFAO over an instrumental, except the word "sexy" is replaced with the "Grand Dad". Other dialogue is added during the cover. As well, when they say "Grand Dad", the song is mashed up with the 7 GRAND DAD title theme, off-key.
At 0:16, the static images changes to various children videos from Spiderman Rhymes, featuring Spider-Man and nursery rhymes. It may be a reference to the weird "family-friendly" children's nursery rhyme videos on Youtube.
This performer's name is referencing to this meme.