Literally "to inject", here: to say things that egg someone on, or provoke someone.
Ir a to'a
"To put one's shirt on", to risk it all.
Ir Hasta Abajo
Literally "to go down", it has two meanings here: the first one: to go down while dancing, to dance Perreo slowly and sensually prostrate. Besides, it is a synonym for "ir a to'a".