This puppet is the original Cookie Monster puppet created in 1969 for Sesame Street. He is able to feed himself because his hands are simply gloves for the performer’s hands, and he has a hole in his mouth that runs down the performer’s sleeve. The cookies that are eaten by Cookie Monster are rice crackers that are made to look like cookies because the oils from actual cookies would damage the puppet.
“Big Spender” is a song from the 1966 musical Sweet Charity, written by Cy Coleman and Dorothy Fields. The song follows a group of “taxi dancers” (women who were paid to dance with men) who are trying to entice men to buy a dance with them.
In the 1973 tv special, Julie on Sesame Street, Julie Andrews performed the song to a dapperly dressed Cookie Monster (Frank Oz), who then begins to eat all of her accessories.
Normally I just post a link to a YouTube video with the song because that’s easier, but all the available clips of this song aren’t the best quality, so I made a clip from the special that someone uploaded to YouTube. Also delightful special in general.