Some of the information is Boop-Oop-a-Dooping full of SPOILERS. Boop-Oop-a-Doop!
The short film begins with a giant Betty Boop flag which flies over the big top. Betty works as a Lion taming artist and a Tightrope walking artist. Another of the other circus attractions is Koko the Clown. While performing on the highwire the villainous Ringmaster lusts for Betty as he watches her from below, singing "Do Something," a song previously performed by Helen Kane. As Betty returns to her tent, the Ringmaster follows her inside and sensually massages her legs, surrounds her and threatens her job if she doesn't submit. Betty begs the Ringmaster to cease his advances, as she sings "Don't Take My Boop-Oop-A-Doop Away." Koko the Clown is outside of the tent, practicing his juggling and hears the struggle from inside the tent. He leaps in to save Betty's virtue, struggling with the Ringmaster who loads him into a cannon, firing it, thinking that he has sent the hero away, laughing with self-satisfaction. But Koko is hiding inside the cannon, and strikes the Ringmaster out cold with a mallet, returning with "the last laugh." When Koko expresses concern about Betty's welfare, she answers in song, "No, he couldn't take my Boop-Oop-a-Doop Away!" The film ends with Koko kissing Betty on the cheek.
Lion: "You dropped your handkerchief!"
Betty Boop: "Thanks!"
Ringmaster: "Do you like your job? Well I think if I was you I would..."
Betty Boop: "You mean?"
Ringmaster: "There'll be no more Boop-Oop-a-Doop outta you!"
Betty Boop: "You brute keep your hands off me, Ooooh help me help!"