First someone fills a bath tub with water, then lays in it with only their dick head exposed. They then proceed to pull a fly's wings off and place it on the newly formed cock island. As the fly runs around, the Tijuana Hat Dance is achieved.
Bill: Hey where did all the flies in the window go?
Sue: Oh Johnny caught them and took them upstairs, he said he needed them for a Tijuana Hat Dance.
Bill: A Tijuana what?
Johnny(muffled over the sound of water running): La cucaracha, la cucaracha, Ya no quieres caminar.